Malicious PDF — malware analysis report

Static analysis result for SHA-256 87992f80c3c64477…

MALICIOUS

PDF

47.3 KB Created: 2020-08-09 16:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d679fb243e199b78c69f2e4257591836 SHA-1: ffc614b3b239ed388beb7f68e4e42a1264a3ab50 SHA-256: 87992f80c3c64477707550a899effa280cd39c1fbfa4998628285a1e112789b7
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body text, though heavily corrupted, contains the URL that is also present in the heuristics and IOCs, suggesting a potential lure related to 'water borne diseases in africa'. The primary malicious link is https://ttraff.cc/pify?keyword=water+borne+diseases+in+africa+pdf, which likely leads 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.cc/pify?keyword=water+borne+diseases+in+africa+pdf
    • http://files.cabinetsbywillowbrook.com/uploads/1/3/1/3/131383651/5975439.pdf
    • http://files.collegeclubofhartford.org/uploads/1/3/1/4/131483719/fomavigemega-filutunimatop-tedasivinavatu.pdf
    • http://files.aelitasattic.com/uploads/1/3/0/8/130874509/xofirirawiti.pdf
    • https://cdn.shopify.com/s/files/1/0431/2793/1029/files/54517063790.pdf
    • https://cdn.shopify.com/s/files/1/0433/9469/5329/files/seller_s_shipping_method.pdf
    • https://cdn.shopify.com/s/files/1/0438/6881/5528/files/andrea_wilson_hacker_facebook.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/rideva.pdf
    • https://cdn.shopify.com/s/files/1/0429/7503/5541/files/pofonedanopez.pdf
    • https://cdn.shopify.com/s/files/1/0434/7628/7645/files/canonical_correlation_analysis_uses_and_interpretation.pdf
    • https://cdn.shopify.com/s/files/1/0435/2606/2239/files/zuvivesedidumewojagulada.pdf
    • https://cdn.shopify.com/s/files/1/0434/5833/0786/files/acid_pro_7._0_key_gen.pdf
    • https://cdn.shopify.com/s/files/1/0431/8085/1364/files/muwosotaxikemuj.pdf
    • https://cdn.shopify.com/s/files/1/0434/8513/5014/files/gifinodiled.pdf
    • https://cdn.shopify.com/s/files/1/0436/0713/0270/files/zixubovujasumupoko.pdf
    • https://cdn.shopify.com/s/files/1/0432/2754/5763/files/92556160282.pdf
    • https://cdn.shopify.com/s/files/1/0437/2742/1608/files/joxelodevirabimuxuxof.pdf
    • https://cdn.shopify.com/s/files/1/0430/7045/5965/files/english_grammar_auxiliary_verbs.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_off00007b1e.bin
dc4a07d292d01db05b1b34395139cc0f2342a2868906ca6e50a4565143a6743b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B1E 5272 bytes
font_01_sfnt_off00008d20.bin
3ef320bec420d10a5f6b062897a0746f13ce3f89dff26629a77e354d3150f947		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D20 10304 bytes

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