Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f58cfc30a923ba…

MALICIOUS

PDF

48.6 KB Created: 2020-07-25 08:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 1eebefe55db2fa24bc783c491d5ee678 SHA-1: 70e5d285f266d08eafb85570e401c77ad28de96c SHA-256: f8f58cfc30a923bad28717054153a46046e79c8b0444dc03b2a89f117528c61d
194 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'machine learning' and the wkhtmltopdf tool, suggesting a lure. The primary attack pattern involves redirecting users to malicious infrastructure via these links.

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=que%20es%20el%20machine%20learning%20pdf In PDF document text
    • http://files.camera1.ca/uploads/1/3/1/3/131380413/pizixejawij.pdfIn PDF document text
    • http://files.mountaincelebrations.co.uk/uploads/1/3/0/8/130813378/6210473.pdfIn PDF document text
    • http://files.printfinishingstore.com/uploads/1/3/1/3/131398573/527217.pdfIn PDF document text
    • http://files.ellianajolenasbows.com/uploads/1/3/0/8/130813852/lurem-koxubuxobowe.pdfIn PDF document text
    • http://files.carlbergbo.com/uploads/1/3/0/7/130775850/df66c75d2.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/1/0428/5697/2455/files/65551285806.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2583/3884/files/panexojozamujolusu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7841/0655/files/tixexeze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7931/9196/files/dinarevejuxokedotexivefi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5606/1850/files/87936917590.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7182/2229/files/zukuropejeg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1334/0316/files/zupin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4874/6651/files/kigisujanipupalatud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0781/1482/files/23301481323.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9043/4456/files/dexogab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0921/1549/files/getupunotifononuboraxag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5906/9599/files/14131382057.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 8

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_off00007d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D62 5324 bytes
SHA-256: ac7bb00c24640a9b4a4cbaf40ba97c3e3f40e752a333d161ff74ea69e1bd32ca
font_01_sfnt_off00008f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F49 11100 bytes
SHA-256: e4e6c0a16f98644a926497a2e70f2bd23bab159b0ff386ecf9c7059029799f03

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