Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd02418dbf2ff7f…

MALICIOUS

PDF

47.8 KB Created: 2020-07-29 09:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f777532d4a31739b9abf657dae3b7088 SHA-1: 47aab3306bc3b340b12433074099c34d5a27c0b2 SHA-256: 5fd02418dbf2ff7fbcbdddb0e8adc2bbebc342d5295e851fa626b3cdd524a2d8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'intermediate fetal monitoring 6th edition test answers', likely a lure to disguise the malicious intent. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence indicate a malicious redirection attempt.

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.com/pify?keyword=intermediate+fetal+monitoring+6th+edition+test+answers
    • http://files.a-la-karte-online.com/uploads/1/3/2/7/132740547/8c986e186.pdf
    • http://files.teviasa.com/uploads/1/3/2/7/132741225/4959704.pdf
    • http://files.lakesiders.net/uploads/1/3/2/6/132681544/ledebojo-temajo-leximejuxaferek.pdf
    • http://files.renattaazzam.com/uploads/1/3/2/6/132680796/4547913.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/3197/0460/files/30809516581.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8971/files/vopizu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3040/4506/files/xadodoz.pdf
    • https://cdn.shopify.com/s/files/1/0438/5862/4672/files/99649624315.pdf
    • https://cdn.shopify.com/s/files/1/0432/4517/4939/files/zeseropulopelosixe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/92161478626.pdf
    • https://cdn.shopify.com/s/files/1/0434/7055/3250/files/xekizarekuwaviz.pdf
    • https://cdn.shopify.com/s/files/1/0431/8956/7650/files/63340834591.pdf
    • https://cdn.shopify.com/s/files/1/0433/5288/3352/files/89620964434.pdf
    • https://cdn.shopify.com/s/files/1/0431/6463/1195/files/31540491572.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42257023754.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007967.bin
ac08d4bd924afc877e843f95447ef81453460f15f9e867c6fc363574b658e9f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7967 5292 bytes
font_01_sfnt_off00008b44.bin
e9c7f66ce7ae894fb486d35a966db3952640e2c87aed0b80490bcfa454fbcabc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B44 11308 bytes

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