Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bef0b400b0ae300…

MALICIOUS

PDF

51.7 KB Created: 2020-08-10 15:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83494f7aec3331dcbaf5d8c00e51a074 SHA-1: a44b31368ecb47a53f2a15ff2061c75cfd8e54dd SHA-256: 5bef0b400b0ae30054d2c5eb44a363f442c77503ada972570f74589d355b0056
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection attempt. One of the primary links, 'https://ttraff.cc/pify?keyword=acredita%25C3%25A7%25C3%25A3o+em+sa%25C3%25BAde+pdf', is flagged as a known malicious redirector. 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.cc/pify?keyword=acredita%25C3%25A7%25C3%25A3o+em+sa%25C3%25BAde+pdf
    • http://files.melrosespeech.com/uploads/1/3/1/4/131407552/vodezeb-gesotepilunide-tuxekafe-tomoxa.pdf
    • http://files.root-and-branch-editing.com/uploads/1/3/1/3/131382148/ee3e8331be94362.pdf
    • http://files.blackwomenstaskforce.org/uploads/1/3/0/8/130814874/xujazuxafe.pdf
    • http://files.glorytabernacleministries.com/uploads/1/3/1/4/131438013/a8626a1638.pdf
    • http://files.anchoryourfootprint.com/uploads/1/3/1/6/131636700/nigekibajajunakujet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/2565/3160/files/los_orgenes_del_neoliberalismo_en_mxico.pdf
    • https://cdn.shopify.com/s/files/1/0427/8432/5798/files/93097486132.pdf
    • https://cdn.shopify.com/s/files/1/0433/6975/8874/files/telecharger_catalogue_oriflame_mars_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/7019/2805/files/water_supply_and_sanitary_engineering_gs_birdie.pdf
    • https://cdn.shopify.com/s/files/1/0432/1142/3902/files/54059984895.pdf
    • https://cdn.shopify.com/s/files/1/0432/3740/8936/files/93041336846.pdf
    • https://cdn.shopify.com/s/files/1/0433/8984/5667/files/7_characteristics_of_the_holy_spirit.pdf
    • https://cdn.shopify.com/s/files/1/0432/7679/6057/files/7936267367.pdf
    • https://cdn.shopify.com/s/files/1/0435/4598/5179/files/lg_hbs_770_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/1481/4885/files/principles_of_naval_architecture_volume_2.pdf
    • https://cdn.shopify.com/s/files/1/0430/8264/5665/files/73591479152.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007988.bin
4eff4b69868e17c66a01226ba6fb3141ce1e93db69f81e629b312cd4b739aa15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7988 5556 bytes
font_01_sfnt_off00008b93.bin
b07a59115b583bb20546437bff7e7768c23297496dd6299d4c2611641576b01b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B93 12596 bytes
font_02_sfnt_off0000b1b1.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B1 4324 bytes

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