Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b8347e46315ec3…

MALICIOUS

PDF

39.8 KB Created: 2020-08-09 07:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53c78a2a16c0a16675e03576d4a10cc3 SHA-1: 6821fd2dfe6a390e8750a9b9414930eb0b2e7210 SHA-256: 73b8347e46315ec371c3d80c0c75a25c1247dc98e7b8957f205c90e84f851112
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the string 'Salesforce pricing pdf' and the malicious URL, suggesting a phishing or scam 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=salesforce+pricing+pdf
    • http://files.sanmarinogirlscouts.com/uploads/1/3/0/8/130873810/8530676.pdf
    • http://kukama.rickgrimes1.com/uploads/1/3/0/8/130874493/besedute-bogalolonasuza.pdf
    • http://files.justinscomics.shop/uploads/1/3/1/4/131454501/79e7076ec1501.pdf
    • http://files.thelegendsataberdeen.com/uploads/1/3/2/6/132695832/melitadakediwiv-notogufe-mibukesupawige.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9888/0680/files/lobexaseguganujoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/1733/1100/files/project_x_soundtrack.pdf
    • https://cdn.shopify.com/s/files/1/0450/9430/5957/files/molivo.pdf
    • https://cdn.shopify.com/s/files/1/0436/2023/7475/files/irrational_exuberance_book.pdf
    • https://cdn.shopify.com/s/files/1/0436/9213/0458/files/wavikobewavov.pdf
    • https://cdn.shopify.com/s/files/1/0438/1668/1629/files/modern_physics_krane_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0431/2668/5858/files/xabuzajegabatetewapawa.pdf
    • https://cdn.shopify.com/s/files/1/0437/0120/7193/files/80376139001.pdf
    • https://cdn.shopify.com/s/files/1/0429/6704/0154/files/gagesezigomeninixo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0790/9794/files/77048903981.pdf
    • https://cdn.shopify.com/s/files/1/0435/2209/7304/files/37141901493.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_off00005dd0.bin
122ef84f2b5f626e4e087a839f766836479fba8ad340cef5315e18f02818d043
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD0 5424 bytes
font_01_sfnt_off0000704f.bin
b1daae1ca5feb974bee91f8d9d73e6d75418529b1e7f893815037302d29cbbf3
pdf-font-stream PDF embedded font (sfnt) at offset 0x704F 10032 bytes