Malicious PDF — malware analysis report

Static analysis result for SHA-256 6818a151b5adc3c2…

MALICIOUS

PDF

81.2 KB Created: 2020-08-10 18:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3bebe547ec091bce7edcb21730e49b11 SHA-1: ab860a6a1f3bad372b24309fe85ee157d85f9b0c SHA-256: 6818a151b5adc3c2db611c779f70733ced11e56ef7f0f2c9cdf6e8fc2a30a430
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a link farm and another flagging a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to 'approaches in teaching writing pdf' and a URL that matches the malicious redirector. This suggests the file is designed to trick users into clicking malicious links, likely for phishing or to download further malware.

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=approaches+in+teaching+writing+pdf
    • http://files.stjamesharlemnyc.org/uploads/1/3/0/9/130968996/c5fb0b50e4.pdf
    • http://files.hicat.org/uploads/1/3/1/4/131483254/rejunutanaseja.pdf
    • http://files.tvlsolutions.com/uploads/1/3/2/6/132682723/kumetedusi_dudusixozit_gewikibozaju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2571/8678/files/metroid_prime_3_walktrhough.pdf
    • https://cdn.shopify.com/s/files/1/0429/9145/2314/files/jedofadasakop.pdf
    • https://cdn.shopify.com/s/files/1/0432/8433/2710/files/carboxiterapia_protocolo_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0435/3707/2280/files/rirebe.pdf
    • https://cdn.shopify.com/s/files/1/0434/9391/6837/files/zijegisupazepojev.pdf
    • https://cdn.shopify.com/s/files/1/0433/8368/5270/files/luteranismo_calvinismo_y_anglicanismo.pdf
    • https://cdn.shopify.com/s/files/1/0435/4693/5451/files/lubomifezexis.pdf
    • https://cdn.shopify.com/s/files/1/0432/4897/6027/files/bodurojujovanutowonitu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/rezobopizabi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2841/3607/files/how_to_cite_dialogue.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/55749471490.pdf
    • https://cdn.shopify.com/s/files/1/0431/7079/1573/files/gadetikokomi.pdf
    • https://cdn.shopify.com/s/files/1/0438/2903/5158/files/sololebinanof.pdf
    • https://cdn.shopify.com/s/files/1/0447/0836/4444/files/watazadazopurunelu.pdf
    • https://cdn.shopify.com/s/files/1/0438/5302/1334/files/updates_were_rejected_because_the_remote.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_off00010154.bin
89ab742be9e77255e610da8901ab0d91a186183d6d32e2c9c391019f316c071d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10154 5468 bytes
font_01_sfnt_off000113ee.bin
84eebe2e5ec06a93752f961b7a020ada8a288c4da3d2faab25cb0908e98631c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113EE 10488 bytes

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