Malicious PDF — malware analysis report

Static analysis result for SHA-256 98118fda245872c4…

MALICIOUS

PDF

60.2 KB Created: 2020-08-08 04:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbf0b2ba2f70b3205f0df0b8f5b2d57a SHA-1: 274088639388bc6be72caf1fe7636ef97d754780 SHA-256: 98118fda245872c46d17b3d12245b2815236607a9aa249cea98657c6feafd4b0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=algebra+2+trig+regents+review+packet+pdf', which is flagged as malicious. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm designed to distribute malicious content or engage in SEO poisoning. 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=algebra+2+trig+regents+review+packet+pdf
    • http://files.villellacustomwoodworking.com/uploads/1/3/0/7/130740069/xigabopa_noweziwumavidam_vufufaguduv_xunotopipedi.pdf
    • http://pekukemam.yangoninternationalchurch.org/uploads/1/3/1/4/131453540/2423863.pdf
    • http://duwilanib.dictionaerie.com/uploads/1/3/2/6/132695492/20ace770.pdf
    • http://files.kathleenhite.com/uploads/1/3/1/0/131070894/liwebofenobo-raravotajefamig-zawir.pdf
    • https://cdn.shopify.com/s/files/1/0435/6522/0003/files/4591363953.pdf
    • https://cdn.shopify.com/s/files/1/0435/0686/0187/files/kenagalone.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jisabisagubimebusogapasof.pdf
    • https://cdn.shopify.com/s/files/1/0431/0528/8352/files/jotewojabolisara.pdf
    • https://cdn.shopify.com/s/files/1/0437/4193/7818/files/30342539102.pdf
    • https://cdn.shopify.com/s/files/1/0430/3696/7063/files/tadawaravelurarezibuba.pdf
    • https://cdn.shopify.com/s/files/1/0431/0676/2903/files/pmf_vs_vs_cdf.pdf
    • https://cdn.shopify.com/s/files/1/0431/7098/8188/files/toregapozosa.pdf
    • https://cdn.shopify.com/s/files/1/0435/5103/1464/files/balexegokorukogimoxuju.pdf
    • https://cdn.shopify.com/s/files/1/0436/8020/2905/files/battery_tender_junior_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/1428/3686/files/36888705152.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_off0000949f.bin
0794bfc2b046f02d5a1581272a0facd89177a849a1542817f8fce08894985e0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x949F 5476 bytes
font_01_sfnt_off0000a75a.bin
7883ca4ff9726224a68645cc9db7292ac192421ce9e9fbd029d46afffa2037b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA75A 14620 bytes
font_02_sfnt_off0000d555.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD555 4324 bytes

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