Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f37b8e476d34a78…

MALICIOUS

PDF

46.3 KB Created: 2020-08-11 08:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a1edf1e664fadd55c4691d328f14f5e SHA-1: c226d1431d390136da62ae8624c81f1dbee2f282 SHA-256: 4f37b8e476d34a782f3c6a090d03b6a4d93de9c7d3e5c451e69dfe9d29052532
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm with 19 external PDF links, many hosted on Shopify, and a primary redirector link to 'ttraff.cc'. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the redirector URL, suggesting the PDF's purpose is to lure users to malicious infrastructure by disguising it as a document about probability density functions.

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=probability+density+function+examples+pdf
    • http://files.mshannahfreeman.com/uploads/1/3/1/4/131409009/wipuperokasibo-xutasomipefuz-zurigem-duboz.pdf
    • http://vuriwit.kateleibrand.com/uploads/1/3/0/9/130969300/sabedefemipipi_kuzubizibonog_vovetususud_xefuxetujux.pdf
    • http://files.hikingnewfoundland.com/uploads/1/3/2/6/132695244/gulax.pdf
    • http://fepog.falithihealing.com/uploads/1/3/0/7/130775169/luboridigi.pdf
    • http://files.2dconference.co.uk/uploads/1/3/1/4/131408954/da3b870.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6436/files/wisexub.pdf
    • https://cdn.shopify.com/s/files/1/0429/6340/2905/files/mapenibinalokusafog.pdf
    • https://cdn.shopify.com/s/files/1/0429/2981/5705/files/verithanam_keyboard_notes.pdf
    • https://cdn.shopify.com/s/files/1/0438/4541/9170/files/96704575691.pdf
    • https://cdn.shopify.com/s/files/1/0433/9797/2135/files/78155991728.pdf
    • https://cdn.shopify.com/s/files/1/0441/2270/1976/files/39646243039.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2622/files/51639845337.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/74133662670.pdf
    • https://cdn.shopify.com/s/files/1/0439/2904/3099/files/66451863478.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5071/files/difovupep.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89089693040.pdf
    • https://cdn.shopify.com/s/files/1/0434/0904/7708/files/aptitude_test.pdf
    • https://cdn.shopify.com/s/files/1/0446/7402/3577/files/private_school_calendar_2020_south_africa.pdf
    • https://cdn.shopify.com/s/files/1/0430/1442/2677/files/84709952109.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006942.bin
9f8cb2faf1f8f8a1eccefa1dea2ebfd240ccfc9143b4b400cbbc2fac8daa310a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6942 5492 bytes
font_01_sfnt_off00007bd6.bin
857ebed5fa74c049f0936db809ec700a84b6a5543d63640c75c703797b8be7a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD6 9944 bytes
font_02_sfnt_off00009ddc.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DDC 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.