Malicious PDF — malware analysis report

Static analysis result for SHA-256 798b37efa4b4cf83…

MALICIOUS

PDF

77.8 KB Created: 2020-08-04 15:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2fdda7ae51d8f578ccec6d20f124ece SHA-1: 4242018ca833b61a40ec21f5e9f417c7d8bf80ae SHA-256: 798b37efa4b4cf83331c8468ad9c088f15d26f188882438e888363f1156063d1
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links, with one identified as a malicious redirector. The document body and heuristics indicate an advance-fee scam lure, aiming to trick users into clicking the malicious link. The presence of embedded links and the nature of the lure suggest an attempt to deliver a second-stage payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=examples+of+ambiguous+sentences+with+two+meanings+pdf
    • http://files.visitathensal.com/uploads/1/3/0/8/130874489/fewozijodaselomagox.pdf
    • http://files.yellowdaisycourt.com/uploads/1/3/1/0/131069904/vebafe.pdf
    • http://files.kidstopinc.com/uploads/1/3/2/6/132681303/foximudiwinig.pdf
    • http://files.rinmakeup.com/uploads/1/3/1/0/131070539/gokozam_dapujevoxab_tetedo.pdf
    • http://fixeze.lifebeyondtrauma.com/uploads/1/3/2/3/132303238/varozizaput_lunuwi_nobolawanura.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/medicion_del_angulo_de_cobb.pdf
    • https://cdn.shopify.com/s/files/1/0440/4235/4853/files/linaxegebofid.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0664/files/60801339947.pdf
    • https://cdn.shopify.com/s/files/1/0428/6713/0534/files/78359919632.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/98886886912.pdf
    • https://cdn.shopify.com/s/files/1/0432/2243/3953/files/datetilifisaza.pdf
    • https://cdn.shopify.com/s/files/1/0437/8283/2289/files/57286271562.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7181/files/diehard_battery_charger_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/2965/0843/files/visekuberoka.pdf
    • https://cdn.shopify.com/s/files/1/0432/8367/7339/files/99918144487.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e31b.bin
2d88a7c1c1b3b6115694437acd340dc0f197468d149938657ddc19ecdf5eb141		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 5612 bytes
font_01_sfnt_off0000f622.bin
37498ffdee820e08e94ed891d1d07dab8c2706dfe8e6bcc223aa93fb38bcf5d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF622 10952 bytes
font_02_sfnt_off00011b5a.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5A 4324 bytes

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