Malicious PDF — malware analysis report

Static analysis result for SHA-256 a942e1f6e1f87d27…

MALICIOUS

PDF

44.9 KB Created: 2020-07-25 12:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 7e8ff2b544811c42e4f758411a355487 SHA-1: 6e177363039104d203947e3f6ed565d07f2e1948 SHA-256: a942e1f6e1f87d273c837f2435dcac79097db1dd7d70addcae971856b6c030db
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, with one pointing to a known malicious redirector. The document body is heavily obfuscated, but the presence of numerous external links, including one to a redirector, strongly suggests a malicious intent, likely for SEO manipulation or to lead users to phishing or malware sites. The file was generated by wkhtmltopdf, which can sometimes be abused for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/wb?keyword=gourmia%206%20qt%20digital%20air%20fryer%20manual In PDF document text
    • http://files.argonautcoffeeleavenworth.com/uploads/1/3/1/1/131163740/f1cf8426eba5bbf.pdfIn PDF document text
    • http://files.picsandwics.com/uploads/1/3/1/8/131856071/zexeselalopopipizij.pdfIn PDF document text
    • http://files.nursing343.com/uploads/1/3/1/4/131453387/160351.pdfIn PDF document text
    • http://files.estherbruer.com/uploads/1/3/0/8/130814534/992839.pdfIn PDF document text
    • http://files.welcometo6h.com/uploads/1/3/1/4/131452953/luximamugubinepa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8491/3565/files/69640866405.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6885/8280/files/79776440838.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80787326618.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5450/5885/files/jiwavabivos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7737/8972/files/41429150278.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1430/7496/files/jisepimokapupofazonut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1676/5087/files/lusebavotebetozorij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4642/7034/files/68526584929.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1191/5421/files/69634262330.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7909/7758/files/dizuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0151/1068/files/dekekorakotodaraf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7190/5698/files/98465006143.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70AF 5344 bytes
SHA-256: c670ea349d774e71e7b8b9947d71547e1dfae6faf96bd823307b5170848852d5
font_01_sfnt_off000082ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82CA 10236 bytes
SHA-256: 14c477eee663f921c56eb0fa79a3a6f8573b3b050ad818deaa34bdf64be0dd17

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