Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4504fb4e439a563…

MALICIOUS

PDF

42.8 KB Created: 2020-07-30 09:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd4c9d17aff458e89aa110046f4e2560 SHA-1: 2211729fb81513ae2afd87d28e54c619453518b7 SHA-256: f4504fb4e439a563623a5b2ac76a31f4be7bceddfa4474f2e48e28165b5058b4
152 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on Shopify, which is indicative of a link farm designed to distribute traffic to various malicious sites. One of the primary links directs to a known malicious redirector, ttraff.cc, further confirming the malicious intent. The document body is heavily obfuscated and appears to be junk data, suggesting the primary function is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.cc/pify?keyword=anatomy+of+permanent+teeth+pdf
    • http://files.spinthehandle.com/uploads/1/3/1/4/131452880/605e481.pdf
    • http://files.letthemlearnllc.com/uploads/1/3/0/7/130776490/610f3f55.pdf
    • http://files.coachboggsrunning.com/uploads/1/3/1/0/131070178/misogifuxazufud_siletofo.pdf
    • http://files.destinwestvacation.com/uploads/1/3/0/7/130776712/8330495.pdf
    • http://files.lyndonstatesga.com/uploads/1/3/1/3/131380741/429f27.pdf
    • http://files.lyndonstatesga.com/uploads/1/3/1/3/13138074
    • https://cdn.shopify.com/s/files/1/0431/0630/4166/files/gesajenuxaxekokubusafero.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/loxidunadubufurepetiverox.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tokon.pdf
    • https://cdn.shopify.com/s/files/1/0428/8118/8003/files/87955159266.pdf
    • https://cdn.shopify.com/s/files/1/0433/1870/6341/files/pebesexiteniposorulutamis.pdf
    • https://cdn.shopify.com/s/files/1/0428/1437/4047/files/livotagetikama.pdf
    • https://cdn.shopify.com/s/files/1/0432/5956/0094/files/riwubefodiginipomadase.pdf
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/kofomitojisomobu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6381/0975/files/99182481726.pdf
    • https://cdn.shopify.com/s/files/1/0436/3524/5214/files/fobag.pdf
    • https://cdn.shopify.com/s/files/1/0429/0409/2828/files/wavimisinezuler.pdf
    • https://cdn.shopify.com/s/files/1/0432/1266/9089/files/dumudeg.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ced.bin
789f298b4f2949ac95c7d7858f37d5623fe2e603e4c1517dd3ff140922ade1c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CED 4900 bytes
font_01_sfnt_off00007d66.bin
8be79504f39a5858179a390ba23bdb350feb3ba19457af7efcd0d8399ed51116		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D66 9616 bytes

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