Malicious PDF — malware analysis report

Static analysis result for SHA-256 34105f0b3cef3b86…

MALICIOUS

PDF

46.1 KB Created: 2020-08-22 22:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d510d23c157c68e6292023e63f9404a SHA-1: 21666b25b11d8e03b7c33283305407892a9caf7b SHA-256: 34105f0b3cef3b86fed4ee6085305e7268a4f9a56320e2f07ebbd2e0f4c3d545
194 Risk Score

Malware Insights

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

The PDF document is identified as malicious due to its structure and embedded links. It contains language suggestive of an advance-fee scam, presenting itself as a study guide while linking to a known malicious redirector. The document also hosts a large number of external PDF links, characteristic of SEO link farm abuse.

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.cc/pify?keyword=navy+expeditionary+warfare+pin+study+guide
    • http://diwad.foundationforadrugfreeworldnewyorkchapter.org/uploads/1/3/0/8/130874493/gosejuwa_zamapanolulujub_xowulujozobis_vagizituf.pdf
    • http://files.wtfmir.shop/uploads/1/3/2/8/132815866/gojusibe-dojam-fijumoduzuk.pdf
    • http://lilav.polishmaids4you.com/uploads/1/3/0/7/130776795/3959153.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6449/9105/files/sufimi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7694/3000/files/afcat_2020_answer_key_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/6245/1611/files/63347686582.pdf
    • https://cdn.shopify.com/s/files/1/0440/0925/9158/files/benim_hocam_matematik_video_ders_notlar_2020.pdf
    • https://cdn.shopify.com/s/files/1/0436/6604/7129/files/ultrasonic_aroma_diffuser_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/9356/6364/files/setup_wizard_android.pdf
    • https://cdn.shopify.com/s/files/1/0434/6744/0294/files/investments_bodie_10th.pdf
    • https://cdn.shopify.com/s/files/1/0431/1059/6765/files/86361621584.pdf
    • https://cdn.shopify.com/s/files/1/0431/2943/8370/files/14502178193.pdf
    • https://cdn.shopify.com/s/files/1/0437/3767/7989/files/37351550271.pdf
    • https://cdn.shopify.com/s/files/1/0428/5802/1027/files/75868220002.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_off000075f5.bin
a751b52b8ab778564ca8d57d801a9abe8d053b8ffb9acef0be4d5954b4feb5cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75F5 5468 bytes
font_01_sfnt_off000088c5.bin
352f7627656136fd4dbe9c468650239a754148a230c9a9936d67eb9347e89829		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88C5 10092 bytes

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