Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f3d863c2db3f29…

MALICIOUS

PDF

57.2 KB Created: 2020-08-16 21:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dadb9246243b7b6a57281eb51e1771d3 SHA-1: 7f1c9db9fa0643ff275afae183cfa9e8eb1ed0fc SHA-256: f1f3d863c2db3f2974f9326155bdcb769ce236ac360cab8d250aeeab2aaa10ca
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded links, with one prominent URL pointing to a redirector service. The document body, though heavily obfuscated, contains text related to a game mod and the malicious URL. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a link to known malicious infrastructure, and the ML_NYX_PDF_MALICIOUS classifier strongly indicates malicious intent. The overall pattern suggests a lure to a malicious site, likely for further malware delivery or phishing.

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=marvel+avengers+alliance+2+offline+mod+apk
    • http://files.jasondearingprops.com/uploads/1/3/1/4/131406391/3271362.pdf
    • http://files.kingsporthorses.com/uploads/1/3/1/3/131383553/1742861.pdf
    • http://files.betheone.co/uploads/1/3/0/7/130740175/1369760.pdf
    • https://cdn.shopify.com/s/files/1/0431/2347/4583/files/26894872597.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/laporan_pendahuluan_angina_pektoris_tidak_stabil.pdf
    • https://cdn.shopify.com/s/files/1/0431/8714/2819/files/bemilefir.pdf
    • https://cdn.shopify.com/s/files/1/0431/7849/2072/files/segebuwasisubokaxi.pdf
    • https://cdn.shopify.com/s/files/1/0436/1460/1378/files/soboreredelamekunineber.pdf
    • https://cdn.shopify.com/s/files/1/0435/3540/1111/files/prenuptial_agreement_sample.pdf
    • https://cdn.shopify.com/s/files/1/0428/8220/3801/files/can_can_violin_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0428/5808/6559/files/sukes.pdf
    • https://cdn.shopify.com/s/files/1/0430/8362/8697/files/da_form_1594_fillable.pdf
    • https://cdn.shopify.com/s/files/1/0434/7078/2614/files/85342792766.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
stream_005_off0000a440.bin
dba6c11b4e8318900fcb3922e1050b6b677c869db708b2da0af98bd17be7a829
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA440 29096 bytes
font_00_sfnt_off00006e24.bin
d0699d4a46477c35f9c3b2126743940a6ce208ef14bba7c11e90c77188247b02
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E24 5736 bytes
font_01_sfnt_off000081ab.bin
24a81d6a063252e9b41cecd8daff670b9ff55048f8788af2c6084adecaca8e8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x81AB 10016 bytes