Malicious PDF — malware analysis report

Static analysis result for SHA-256 164f7b405f3dd6b0…

MALICIOUS

PDF

40.2 KB Created: 2020-08-24 01:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f895f4330ed31a11a412212e571b07f SHA-1: e9bd9d494e613e09134f3eb6a60bb747135c95ad SHA-256: 164f7b405f3dd6b0db9444dfe5a6c3d818cdcd91bee541a91841d3ae6e1e8fbf
162 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, suggesting a phishing or scam attempt disguised as educational content. The presence of a 'download button' heuristic further supports a lure-based attack. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=algebraic+equations+worksheets+grade+8
    • http://tapifum.coachevelyne.com/uploads/1/3/1/6/131606677/sedusoxadozokam-wibinizolurez-dirixoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6112/5013/files/android_architecture_components_sample.pdf
    • https://cdn.shopify.com/s/files/1/0438/2759/3376/files/catholic_study_bible_donald_senior.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2676/files/7810308845.pdf
    • https://cdn.shopify.com/s/files/1/0460/1924/8295/files/adobe_reader_barcode_fonts.pdf
    • https://cdn.shopify.com/s/files/1/0434/5158/0568/files/dulapokesuxigedatixis.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2676/files/nokagipusutikitinane.pdf
    • https://cdn.shopify.com/s/files/1/0428/0025/1036/files/pevuretego.pdf
    • https://cdn.shopify.com/s/files/1/0431/9982/4032/files/56853014231.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_off000059be.bin
3afadc616e683fba9c457663b6d58b1b24e44654544bb859e0161624302b6046
pdf-font-stream PDF embedded font (sfnt) at offset 0x59BE 5804 bytes
font_01_sfnt_off00006d7d.bin
d54c3a09b0cbc79e4fead592a19d9041028ff6bf3893b78d0742f9cda385fb4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D7D 12216 bytes