Malicious PDF — malware analysis report

Static analysis result for SHA-256 610ac8b79b764f5a…

MALICIOUS

PDF

38.1 KB Created: 2020-07-25 08:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 64041c30966d8f05678addaf081b35c9 SHA-1: 70288f00abc4b2a588fc5ef5390cf72dd63c4573 SHA-256: 610ac8b79b764f5a27293a6a0d420529272c36d7a0b6341b36938456303cbb61
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to a redirector service (ttraff.com) known for malicious activity. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure related to sheet music, suggesting a phishing or social engineering attempt to trick users into clicking the malicious 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=speak%20softly%20love%20sheet%20music%20pdf In PDF document text
    • http://files.connollyspuppies.com/uploads/1/3/1/4/131438240/130b72893ebd.pdfIn PDF document text
    • http://files.donesladventure.com/uploads/1/3/0/7/130740112/2077771.pdfIn PDF document text
    • http://files.rachellepaintings.com/uploads/1/3/1/3/131383581/76049ebb.pdfIn PDF document text
    • http://files.mwf-ec2019.com/uploads/1/3/2/7/132712358/komewubadoxo.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/1/0431/3592/6434/files/6965210923.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/naluzekofijatiroxutu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3595/9191/files/tadafitizuxezozefa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5390/6080/files/95839445284.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4809/8209/files/42488985437.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4844/9686/files/5179329266.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/zumavidirinuxadabejox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/wudedejekopabitupewiko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3698/2943/files/wakewi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/59554496318.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2521/1296/files/nekuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9696/4261/files/gutoruwadebero.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9113/1554/files/dimoxakemumusug.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 4

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_off00005764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5764 5404 bytes
SHA-256: 646261ce6c954038ffcd75ae38b786b6946225afcad7c0f142cae2c4c9fadd67
font_01_sfnt_off000069da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69DA 9672 bytes
SHA-256: bd2b69fb716207e4a2d2da4fbfd2c2af2d7e04e02f5ccda8a66b5bb5224dd8a4

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