Malicious PDF — malware analysis report

Static analysis result for SHA-256 622fdcf44e1fbdcf…

MALICIOUS

PDF

52.9 KB Created: 2020-08-31 13:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b8aab54ca9ae5bf9f27e4e64e4c0a38 SHA-1: bd24d982cebf948881453757698c72c8f300d279 SHA-256: 622fdcf44e1fbdcfb747b3fa495413b320cbc4ba9f7bf8e4b0d30a4d1ee6f405
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting it is a 'worksheet', likely a lure. The presence of numerous external PDF links also points to a link farm, a common tactic for SEO poisoning or distributing malicious content.

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/wix?keyword=worksheet+mole+problems
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/93971e_77907d305d9a474ca94065a57a6532b2.pdf
    • https://static.usrfiles.com/ugd/cf14a4_10605f59a37449d18feca3409b0b9a20.pdf
    • https://static.usrfiles.com/ugd/1e32c2_f318af1efa10498e82906c8199601cb3.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_b25b66c7d2c24d8fb66aa5b0c7836ffc.pdf
    • https://static.usrfiles.com/ugd/77eba6_2646463c19fe43cbbde74976b870b271.pdf
    • https://cdn.shopify.com/s/files/1/0428/0408/4899/files/pegasukubugaluxisuvu.pdf
    • https://cdn.shopify.com/s/files/1/0437/4921/2309/files/97648413457.pdf
    • https://cdn.shopify.com/s/files/1/0435/5037/6100/files/29666371720.pdf
    • https://cdn.shopify.com/s/files/1/0429/1877/2903/files/40810408779.pdf
    • https://cdn.shopify.com/s/files/1/0434/6901/3157/files/mejoxodit.pdf
    • https://cdn.shopify.com/s/files/1/0431/7914/7430/files/kikazemevujuwofavovi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4837/8280/files/85387322365.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7719/files/3679840082.pdf
    • https://cdn.shopify.com/s/files/1/0446/8106/8697/files/comparing_and_contrasting_texts_lesson_19_answers.pdf
    • https://cdn.shopify.com/s/files/1/0438/9208/0795/files/bowetogep.pdf
    • https://cdn.shopify.com/s/files/1/0435/5260/4328/files/tidokilixuwavolagur.pdf
    • https://cdn.shopify.com/s/files/1/0429/3397/7255/files/42326263401.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_off000084f6.bin
96f3d404a79fa4e49b0c87f47979a2357e909b7fe6e0678262de792576789884		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84F6 4700 bytes
font_01_sfnt_off000094fa.bin
bceb70609db9020a1e432775405e84590e88626619901ba294b8c0bfcd9af817		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94FA 10260 bytes
font_02_sfnt_off0000b824.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB824 4324 bytes

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