Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1b3402f95cc384…

MALICIOUS

PDF

41.9 KB Created: 2020-08-07 04:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16d839df3aaadfd1ecad3aabe5aed360 SHA-1: 0195afa972f29fc80da8ea9efbf5c17173cdb1a8 SHA-256: 7f1b3402f95cc384811d55471c8ac7dbd9af56ff98db68a14d341b58f1a44118
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the primary malicious URL and numerous other URLs that appear to be part of a link farm. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=messiah+in+judaism+pdf
    • http://files.mariagmaas.com/uploads/1/3/0/7/130775554/5179188.pdf
    • http://files.hollingertennis.net/uploads/1/3/1/8/131856224/656745.pdf
    • http://files.adurtreesurgeon.com/uploads/1/3/1/6/131636891/46f5f59eb2cf6f8.pdf
    • http://files.allendaleinsurance.com/uploads/1/3/1/6/131607163/mupevojizamufowike.pdf
    • http://files.daintydande.com/uploads/1/3/1/3/131379039/katotigejuw_tilijog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7745/8334/files/instax_wide_300_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/7538/7043/files/bezanudososuvufumiga.pdf
    • https://cdn.shopify.com/s/files/1/0430/7157/0069/files/96726536720.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/bokenalega.pdf
    • https://cdn.shopify.com/s/files/1/0432/6542/5570/files/74381694480.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/pukijexedoligofen.pdf
    • https://cdn.shopify.com/s/files/1/0432/6742/4412/files/zotob.pdf
    • https://cdn.shopify.com/s/files/1/0439/2907/5880/files/how_to_dump_a_3ds_rom.pdf
    • https://cdn.shopify.com/s/files/1/0430/2739/8807/files/92905426197.pdf
    • https://cdn.shopify.com/s/files/1/0436/4235/5865/files/11162931339.pdf
    • https://cdn.shopify.com/s/files/1/0431/5929/0022/files/pigid.pdf
    • https://cdn.shopify.com/s/files/1/0449/1404/9191/files/today_malayala_manorama_news_paper.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_off000065ee.bin
ac091e251ba0c7b20f9d2466dd1fa49f30b4b4422e78e276005367c9581c770b
pdf-font-stream PDF embedded font (sfnt) at offset 0x65EE 5236 bytes
font_01_sfnt_off000077aa.bin
fc7c23dd2b4dbe2a04b62312efe598caf2451930eb61ddfa520a1d697d826a1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x77AA 10292 bytes