Malicious PDF — malware analysis report

Static analysis result for SHA-256 691e33f1f3d731f1…

MALICIOUS

PDF

42.9 KB Created: 2020-08-20 12:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aea11f9313ee50ad88ab9342f5ed8455 SHA-1: c933b0d5eac24cceec39eb75c6add6a4b9eda9d6 SHA-256: 691e33f1f3d731f168dd1e8456984825375a9c3683ed6aee99db540d29b86672
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO spamming operation. One of the primary links, https://ttraff.ru/pify?keyword=aha%252F+acc+2018+cholesterol+guidelines, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to academic guidelines and URLs, reinforcing the lure. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=aha%252F+acc+2018+cholesterol+guidelines
    • http://vewovogug.ssaaalbury.com.au/uploads/1/3/2/3/132303195/savotuwatotejizadoge.pdf
    • http://zajaxe.huffmanshomestead.com/uploads/1/3/1/6/131606255/1691420.pdf
    • http://zunomo.drshomoknows.com/uploads/1/3/0/8/130874050/butolajijajof.pdf
    • http://jataratuw.dwback2nature.com/uploads/1/3/1/6/131606490/cd8cf6d8a2b04d2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/25668779603.pdf
    • https://cdn.shopify.com/s/files/1/0435/3271/4139/files/juxejaso.pdf
    • https://cdn.shopify.com/s/files/1/0431/1023/6321/files/89454025441.pdf
    • https://cdn.shopify.com/s/files/1/0437/8905/8209/files/wafurafanududovolimi.pdf
    • https://cdn.shopify.com/s/files/1/0459/2556/4567/files/chupke_chupke_movie_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/2230/3911/files/xovoxuwo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0966/2366/files/zuxatikenubo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9593/2584/files/autodesk_inventor_animation_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/wuzakovojobimezidijavupok.pdf
    • https://cdn.shopify.com/s/files/1/0433/8194/8567/files/que_es_anemia_microcitica_hipocromica.pdf
    • https://cdn.shopify.com/s/files/1/0440/8921/3093/files/b_d_chaurasia_anatomy_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1573/files/fochlucan_bandore_5e.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_off00006695.bin
0df34f43cc506ca4a06ab7340c000c5a462e4cecde03252a92db44cce6939b95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6695 5744 bytes
font_01_sfnt_off00007a1b.bin
dac2576f67a27a9ad0716990e1b7eacb7b83615de63e14ddd1df4c543d9794cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A1B 10512 bytes

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