Malicious PDF — malware analysis report

Static analysis result for SHA-256 007045d0d7991c2e…

MALICIOUS

PDF

58.2 KB Created: 2020-08-13 16:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e12a6595b4032336b8aae1d2aa8473c7 SHA-1: 0e40de96ef88a97ca97c3403795bd88b230cf4a3 SHA-256: 007045d0d7991c2e0be843a50a849301a4a219ef078ed94e5098594e6eaffb6d
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external resources, suggesting a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/wb?keyword=applications%20of%20trigonometric%20ratios%20worksheet'. The document body, though heavily obfuscated, also contains this URL, reinforcing the malicious intent. The ML classifier strongly supports the malicious verdict.

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/wb?keyword=applications%20of%20trigonometric%20ratios%20worksheet
    • http://files.varanasiastro.com/uploads/1/3/2/6/132696117/titozamozid.pdf
    • http://files.forestcityfarms.com/uploads/1/3/0/7/130739924/5b2b607e86e.pdf
    • http://files.naspain.com/uploads/1/3/0/7/130775092/rifugiguga.pdf
    • http://tuzerulez.bellanaturareggio.org/uploads/1/3/0/8/130874493/sarote.pdf
    • http://files.thebackyardsalad.com/uploads/1/3/0/8/130873927/c97072f3499e2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/6923/5619/files/47082808670.pdf
    • https://cdn.shopify.com/s/files/1/0447/1390/2234/files/gakenisuzofo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1058/7800/files/15531386924.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6636/files/kadogagalatofejuxotebum.pdf
    • https://cdn.shopify.com/s/files/1/0431/2078/7613/files/ritepefigibuvakofuvo.pdf
    • https://cdn.shopify.com/s/files/1/0437/9164/6880/files/bike_repair.pdf
    • https://cdn.shopify.com/s/files/1/0435/7134/7619/files/fitukojolusum.pdf
    • https://cdn.shopify.com/s/files/1/0432/4173/4312/files/76922128596.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9128/files/gary_vaynerchuk_crush_it.pdf
    • https://cdn.shopify.com/s/files/1/0432/9360/6046/files/nejegaboremiberuvalawa.pdf
    • https://cdn.shopify.com/s/files/1/0434/7471/4790/files/carnitina_suplemento_deportivo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7991/6967/files/html_degree_symbol.pdf
    • https://cdn.shopify.com/s/files/1/0429/6382/8895/files/78700793754.pdf
    • https://cdn.shopify.com/s/files/1/0435/7190/4673/files/terigefenolis.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000738b.bin
092acf35c1840c6a14b505d8d5d94b041d3e1d70b365bb079cae07198c069a7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x738B 3040 bytes
font_01_sfnt_off00007e77.bin
448463c7f19f82f54a0c446c072647e83864dff877271779d9a39964b8082c72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E77 5364 bytes
font_02_sfnt_off0000908f.bin
ef39f8db87876052d01b309b0948e70e20b7431b489dce31e04c073aec986382		 pdf-font-stream PDF embedded font (sfnt) at offset 0x908F 11336 bytes
font_03_sfnt_off0000b74a.bin
f6a2addf5bfea128be20d2d600ea6d8400db7b4113a30bea02c59bd04a4e7ccb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB74A 16188 bytes
font_04_sfnt_off0000cc83.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC83 4324 bytes

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