Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d05abe93b991c5b…

MALICIOUS

PDF

145.3 KB Created: 2020-08-10 15:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3cc6d2a2dc24fd4bdfa42a093422730 SHA-1: d6a2746a8f61c74baf751f88513f3ba6872977f5 SHA-256: 5d05abe93b991c5b23ad56d568101d51995b816561f42fcd606b7aa540a1e7fd
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a link farm, and one specifically to a known malicious redirector. The document body, though obfuscated, contains text related to 'Autocad pdf frame variable' and a URL that strongly suggests an advance-fee scam or phishing lure. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.com/pify?keyword=autocad+pdf+frame+variable
    • http://wulajaxon.mox-vr.com/uploads/1/3/0/8/130814328/modidovilomewaxuwe.pdf
    • http://files.studioappalachia.com/uploads/1/3/2/6/132681823/mofikow.pdf
    • http://jezapoko.hootenbio.com/uploads/1/3/1/0/131071157/fulizetawega-foxeta.pdf
    • http://dofixaf.thehealthyessence.com/uploads/1/3/0/8/130874064/dulenumasatuxukabota.pdf
    • http://files.triplestarbn.com/uploads/1/3/2/6/132681970/siredebazimis-zevom-majewejer-simivuti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4238/1725/files/media_query_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0436/6227/8809/files/95866984668.pdf
    • https://cdn.shopify.com/s/files/1/0430/5590/6967/files/tejafud.pdf
    • https://cdn.shopify.com/s/files/1/0431/2177/0657/files/90771467016.pdf
    • https://cdn.shopify.com/s/files/1/0429/8339/1395/files/44647436722.pdf
    • https://cdn.shopify.com/s/files/1/0435/6544/9371/files/dozoko.pdf
    • https://cdn.shopify.com/s/files/1/0435/3445/0840/files/17768101973.pdf
    • https://cdn.shopify.com/s/files/1/0431/2832/4257/files/92812043599.pdf
    • https://cdn.shopify.com/s/files/1/0431/4752/6305/files/bash_try_catch.pdf
    • https://cdn.shopify.com/s/files/1/0436/5529/9237/files/balance_of_payment_of_pakistan.pdf
    • https://cdn.shopify.com/s/files/1/0436/8669/0969/files/fujuzirupusegarumiwobigo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7988/3170/files/41365680102.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kevesuladufutaniwor.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_off00020057.bin
5e0f85166cb57e2a15ca205b6967507ec18d87f1c572798d9b410e2889c8e808		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20057 5312 bytes
font_01_sfnt_off0002124f.bin
e6126beff49ddb0705c6f51742a5c340d0988f51fbc1818f78ff8b855e5451bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2124F 11456 bytes

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