Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6a082b80889c9a1…

MALICIOUS

PDF

56.8 KB Created: 2020-08-31 01:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d45738a3330037b79bf223b21a2e9895 SHA-1: 65c4fd3e25940ef967411955b6e64a6d02d75ee4 SHA-256: e6a082b80889c9a157bd9d8efa3a738b4c81ff42576aefc26cac33d7f37aa847
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic firing for a malicious redirector link. The link points to 'ttraff.ru', which is known malicious infrastructure. The document body, though heavily obfuscated, also contains this URL. The presence of numerous other benign-looking PDF links suggests a potential SEO poisoning or link farm tactic to obscure the malicious intent.

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.ru/wix?keyword=a+chinese+odyssey+part+two+cinderella+subtitle+indonesia
    • https://static.usrfiles.com/ugd/98e298_45321dfa2046484e8aa2ef2df04c40eb.pdf
    • https://static.usrfiles.com/ugd/764aaa_adc41db1953346db8452e1a243cb50d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_486f1f31eea14163a8fc8d6835a42799.pdf
    • https://static.usrfiles.com/ugd/097bd5_6ae36f82328b4a4ea2e33ab615b1f6f2.pdf
    • https://static.usrfiles.com/ugd/b8c837_fef08631cb184895a3de57d13cc79efe.pdf
    • https://static.usrfiles.com/ugd/b8c837_bec8841ca7bc4414be601f9d0ff2c196.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zosakasebiribo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/savowogofoxifonikili.pdf
    • https://cdn.shopify.com/s/files/1/0436/6086/9785/files/english_word_meaning_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7128/3098/files/nixadezorejewusukowo.pdf
    • https://cdn.shopify.com/s/files/1/0438/6055/7984/files/zosutonekokagopefexasegaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/35022180152.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061b8.bin
518a0e0480b27c3342e0ab4878c294025fa7022eafa5310bc35dd13fcfc13329		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61B8 14972 bytes
font_01_sfnt_off00009125.bin
8ab4496fb26b8ede3c364eddd0a340bf19d0bfdf1f42bc5f19bde69c8c29eeb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9125 5368 bytes
font_02_sfnt_off0000a358.bin
1dc513ae37e99c2e69f1079a7892fc8f1b8b7ae6a6c958e84dca47bf8d0be87a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA358 10992 bytes
font_03_sfnt_off0000c74c.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC74C 4324 bytes

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