Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f6806b5f709b10…

MALICIOUS

PDF

66.8 KB Created: 2020-08-22 15:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f042fb402823ac01ed0e75762cdd565 SHA-1: 4277081bfff3e2c9d759031c919f42cdd365b3ce SHA-256: 94f6806b5f709b100c4e85d9876f7c881d959cf260773d88c7355fe749b01f8e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=derivatives+of+inverse+trig+functions+worksheet+pdf'. This URL is presented within the document body as a link to a worksheet. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to lure victims. The ML classifier also strongly flagged this PDF as malicious.

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=derivatives+of+inverse+trig+functions+worksheet+pdf
    • http://pajazupo.openheartmindfulness.org/uploads/1/3/1/4/131483061/rokub.pdf
    • http://files.innerpoweryogauk.com/uploads/1/3/0/7/130775098/wanozokuvopatere.pdf
    • http://files.everyonesopera.com/uploads/1/3/0/8/130814874/cc4b169ab5.pdf
    • http://files.sole-therapy.com/uploads/1/3/2/6/132682051/cfb0dc.pdf
    • https://cdn.shopify.com/s/files/1/0428/2341/8019/files/78373739393.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9957/files/rapusogedogofefegopemedu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6645/7254/files/zejegujiwebebapuvurigojos.pdf
    • https://cdn.shopify.com/s/files/1/0435/4814/7867/files/75779585932.pdf
    • https://cdn.shopify.com/s/files/1/0439/3621/9291/files/wawonarabuwasidarudigo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/10143998246.pdf
    • https://cdn.shopify.com/s/files/1/0434/2965/8790/files/sibizawasokatup.pdf
    • https://cdn.shopify.com/s/files/1/0440/8567/4149/files/petrografi_batuan_sedimen_klastik.pdf
    • https://cdn.shopify.com/s/files/1/0435/7256/0033/files/windows_xp_professional_product_key_64_bit.pdf
    • https://cdn.shopify.com/s/files/1/0437/3620/3415/files/kumizafazesikibugolaxus.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/71392846725.pdf
    • https://cdn.shopify.com/s/files/1/0438/4056/9509/files/hush_imdb_parents_guide.pdf
    • https://cdn.shopify.com/s/files/1/0438/4302/7109/files/filufekidesininapitiwomu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae7e.bin
4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7E 2828 bytes
font_01_sfnt_off0000b879.bin
84a824f0f1920e1f92e157a484ad287333bf38932507b29742d32e3ed74f2453		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB879 5480 bytes
font_02_sfnt_off0000cb33.bin
ac8c415c8ab7102a1975be9f2351324786dabf1fb3a655ecb65eec546feaee03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB33 9820 bytes
font_03_sfnt_off0000ecbf.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECBF 4324 bytes

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