Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f6478b28afa2e4…

MALICIOUS

PDF

41.2 KB Created: 2020-08-03 16:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0f6fd079be894a0244a6c21046f51ca SHA-1: b954c9f157ed543e7d8a5642ef0c95d0c152d43d SHA-256: 70f6478b28afa2e456f1862ddf36a60f2c984c408ac6f3aa8714654eb9931949
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to what appears to be a link farm designed to host other PDFs. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=jurnal+akuntansi+pajak+pph+21+pdf'. This suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

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=jurnal+akuntansi+pajak+pph+21+pdf
    • http://files.demsumgudpralines.com/uploads/1/3/0/7/130739517/toxewefasuvevuk-sutimaderojilam-pekitidim.pdf
    • http://files.yoursecondopinionllc.com/uploads/1/3/0/7/130740033/kojorevi_niriwegare_regedirosowaju_mebipu.pdf
    • http://files.gobrazil.co.uk/uploads/1/3/2/8/132814342/sisesawalawiv-kadegi.pdf
    • http://files.serendipityondurham.com/uploads/1/3/1/8/131872104/tirorijo.pdf
    • http://files.lakewashingtonsaddleclub.org/uploads/1/3/1/8/131857916/64e9fa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8624/2201/files/vufodegifotit.pdf
    • https://cdn.shopify.com/s/files/1/0433/2145/8853/files/jiwezixofigalebukeme.pdf
    • https://cdn.shopify.com/s/files/1/0440/2210/4229/files/44579708086.pdf
    • https://cdn.shopify.com/s/files/1/0429/7526/4919/files/dudipafawujat.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dosoxuwananeworatimuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/7330/5750/files/logipevubix.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7189/files/wufagabasob.pdf
    • https://cdn.shopify.com/s/files/1/0432/0336/2973/files/the_downward_spiral_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0435/7157/6993/files/wuloxut.pdf
    • https://cdn.shopify.com/s/files/1/0447/9166/0695/files/big_balls_acdc_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/xarisitivojenubabew.pdf
    • https://cdn.shopify.com/s/files/1/0432/6372/1637/files/wawozumafefava.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_off00006124.bin
4ac6de05a5dcd00ae956992fe5b3a450bed71f7e9a566492d14ba59b4712ca75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6124 5444 bytes
font_01_sfnt_off000073ad.bin
adffaa6d23c7949bd92a4782c052a75506fd093cd9f13f901827cdd43c3da49f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73AD 10680 bytes

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