Malicious PDF — malware analysis report

Static analysis result for SHA-256 227bab7b16c04d7f…

MALICIOUS

PDF

43.4 KB Created: 2020-08-13 21:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fcbcb9e927800f3390e152704f37552 SHA-1: bdc7f8614caabbb1314b77e26a732c40b9a92a22 SHA-256: 227bab7b16c04d7f6ea773b1b6bb3e43317cad9f91caf1c823768f00cf8e843e
152 Risk Score

Malware Insights

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

The PDF contains a prominent link disguised as a technical resource, which redirects to a malicious URL. This is further supported by heuristics indicating the PDF links to known malicious redirector infrastructure and a link farm. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering through a deceptive link.

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=core+java+mock+test+with+answers
    • http://xuzutaro.northeastminneapoliselectrician.com/uploads/1/3/1/4/131483068/86256.pdf
    • http://files.mahimashahverma.com/uploads/1/3/0/7/130738636/2386507.pdf
    • http://toronos.jaspercountycommunityservices.com/uploads/1/3/1/3/131381679/f69f09d1b.pdf
    • http://sadog.eurokreations.com/uploads/1/3/1/4/131437462/8422b8.pdf
    • https://cdn.shopify.com/s/files/1/0432/2305/6545/files/bearing_size_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0428/7086/6087/files/chemistry_vocabulary.pdf
    • https://cdn.shopify.com/s/files/1/0435/5037/6100/files/29666371720.pdf
    • https://cdn.shopify.com/s/files/1/0428/5880/7455/files/zivuguga.pdf
    • https://cdn.shopify.com/s/files/1/0429/5104/9370/files/siralazimulug.pdf
    • https://cdn.shopify.com/s/files/1/0432/5592/2852/files/buredajokunoloduwivenil.pdf
    • https://cdn.shopify.com/s/files/1/0434/3886/6584/files/python_ssh_without_library.pdf
    • https://cdn.shopify.com/s/files/1/0433/0147/0366/files/compare_and_contrast_print_and_broadcast_media.pdf
    • https://cdn.shopify.com/s/files/1/0428/1165/4307/files/histologia_alveolos.pdf
    • https://cdn.shopify.com/s/files/1/0431/6066/6274/files/38881260989.pdf
    • https://cdn.shopify.com/s/files/1/0431/1960/7962/files/gepuwotidibabul.pdf
    • https://cdn.shopify.com/s/files/1/0435/3818/6392/files/58913432501.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059e3.bin
f3e613a7fc3883114d2131be59bdd7da46903cd5d4b7bccbe6724202389896c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59E3 5112 bytes
font_01_sfnt_off00006b31.bin
87ca71943fd710e694f4d166123a421810ff5b8aecaad1b163869ed84fef1b73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B31 11492 bytes
font_02_sfnt_off00009257.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9257 4324 bytes

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