Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ffa16926536f8c7…

MALICIOUS

PDF

47.7 KB Created: 2020-08-12 07:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00342249bd1253b301653abbf3156da0 SHA-1: 4ea2191cf4a5380fd0c6673f88e1ecb8303b1246 SHA-256: 7ffa16926536f8c70162b4b0554d427158595d7e2077b1ea20b85981f3c440f9
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF that contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged the document as a potential advance-fee scam lure. The document body, though heavily obfuscated, contains text that appears to be related to a book and includes the malicious URL, suggesting the intent is to trick the user into visiting the redirector. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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=baghban+book+pdf+in+urdu
    • http://files.dblabservices.com/uploads/1/3/1/4/131407424/sibug_bevabudiroz.pdf
    • http://files.mccubbinresilience.org/uploads/1/3/0/8/130814680/wikixetevedukulo.pdf
    • http://files.childrenfirstcurriculumusa.com/uploads/1/3/2/6/132695194/7096466.pdf
    • http://files.heartsfrommali.org/uploads/1/3/1/4/131406827/7711014.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/8184/3356/files/joxolakufupimeriju.pdf
    • https://cdn.shopify.com/s/files/1/0428/1620/9059/files/nipesuwu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1025/1176/files/22048626437.pdf
    • https://cdn.shopify.com/s/files/1/0440/6578/3958/files/south_lomei_labyrinth.pdf
    • https://cdn.shopify.com/s/files/1/0437/3423/7345/files/jerozo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6881/6544/files/django_array_field.pdf
    • https://cdn.shopify.com/s/files/1/0431/6345/1560/files/wafakuzinugirem.pdf
    • https://cdn.shopify.com/s/files/1/0431/3874/4469/files/1113095038.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2342/files/xuvewepojogosidal.pdf
    • https://cdn.shopify.com/s/files/1/0436/3599/8880/files/57167203252.pdf
    • https://cdn.shopify.com/s/files/1/0431/8078/5821/files/bolivia_water_war_project.pdf
    • https://cdn.shopify.com/s/files/1/0429/2578/5255/files/40873885947.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5309/files/9448390260.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_off00007076.bin
501da2a540ee0f5387496a3d987bcb1cce9241d08f5cfe1178d77c084a8b385b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7076 5032 bytes
font_01_sfnt_off0000816f.bin
474a055b0281ea77c6de14195279b1a24302cb59853e87c977dfe2676de96b8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x816F 10144 bytes
font_02_sfnt_off0000a415.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA415 4324 bytes

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