Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b7e30b2cede6c56…

MALICIOUS

PDF

38.7 KB Created: 2020-08-11 18:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34ecc4b5cefda844b6a25f5cc8b4e59d SHA-1: 1c18032e4cb3bb01a4d0c249e78fb8940ea47c26 SHA-256: 2b7e30b2cede6c5610d3602630c0460fd519c9a3bfc091cf6e7015f9660511f9
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, embedding numerous external links, many of which are hosted on seemingly benign platforms like Shopify but likely serve as a distribution point. The primary malicious URL identified is https://ttraff.ru/pify?keyword=c%25C3%25A9u+inferno+alfredo+bosi+pdf, which is likely used to redirect users to further malicious content.

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=c%25C3%25A9u+inferno+alfredo+bosi+pdf
    • http://pozikurij.tambercreekservices.com/uploads/1/3/1/6/131606349/fagipivijala.pdf
    • http://files.rn-photo.com/uploads/1/3/1/1/131163841/vubawogikawazut.pdf
    • http://lejugezik.gulfbreezerotary.com/uploads/1/3/1/3/131381428/c48a763.pdf
    • http://files.roseebudsllc.com/uploads/1/3/2/7/132711961/najivefawipela_goruzat.pdf
    • http://mafumuw.middlevillemuseum.org/uploads/1/3/2/7/132710621/gidaje-bakutugifexo-wizegikukalez.pdf
    • https://cdn.shopify.com/s/files/1/0428/8207/2739/files/webisigoxakosenag.pdf
    • https://cdn.shopify.com/s/files/1/0428/5631/7091/files/sipovafolezixiwok.pdf
    • https://cdn.shopify.com/s/files/1/0431/4755/9066/files/sudo_killall_coreaudiod.pdf
    • https://cdn.shopify.com/s/files/1/0434/2048/3751/files/94473545388.pdf
    • https://cdn.shopify.com/s/files/1/0431/0935/1575/files/6733868936.pdf
    • https://cdn.shopify.com/s/files/1/0428/9029/7507/files/aerial_lift_annual_inspection_form.pdf
    • https://cdn.shopify.com/s/files/1/0437/8991/0165/files/tuwoxarilevilivagujebepot.pdf
    • https://cdn.shopify.com/s/files/1/0430/6924/3549/files/33620116602.pdf
    • https://cdn.shopify.com/s/files/1/0433/0458/3318/files/soweluxuxolevov.pdf
    • https://cdn.shopify.com/s/files/1/0447/5686/1077/files/duvibonewiwefe.pdf
    • https://cdn.shopify.com/s/files/1/0452/4271/2221/files/approve_bula.pdf
    • https://cdn.shopify.com/s/files/1/0431/6512/2720/files/migagenagax.pdf
    • https://cdn.shopify.com/s/files/1/0428/4855/1068/files/80698139197.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_off00005543.bin
74733c8a0237195f3209047eb0ddd595708d7c0320d6fbcef991350e45769252		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5543 5224 bytes
font_01_sfnt_off000066bb.bin
fb073b3359e991060a096319845e659ae78563b1916b0777ac140a50f1035573		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66BB 12304 bytes

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