Malicious PDF — malware analysis report

Static analysis result for SHA-256 073fc37f839ed670…

MALICIOUS

PDF

55.3 KB Created: 2020-08-22 13:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06a558620962b9e5921c5e086ec25ff0 SHA-1: f86f00941991bef4b8bdc1c6a31bc52c3fb532af SHA-256: 073fc37f839ed67080f9065acb04108f29c2316520a710c6f0e5a76980359624
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous external links, many of which point to a link farm designed to manipulate search engine results. One critical heuristic identified a link to a known malicious redirector infrastructure at https://ttraff.cc/pify. The document body, though heavily obfuscated, also contains this URL and other PDF links, suggesting an attempt to drive traffic to malicious or SEO-manipulated sites. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=bridal+shower+sheet+cake+images
    • http://bumujav.gogroweducationalconsultingtutoring.com/uploads/1/3/2/6/132695643/1727642.pdf
    • http://gosisarip.digitaildesigns.com/uploads/1/3/1/4/131454859/wiwavegutavevetediz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/0331/3308/files/29974716560.pdf
    • https://cdn.shopify.com/s/files/1/0435/2878/1973/files/69928219487.pdf
    • https://cdn.shopify.com/s/files/1/0437/4170/8453/files/christian_bible_study_books.pdf
    • https://cdn.shopify.com/s/files/1/0437/2063/8632/files/39449185772.pdf
    • https://cdn.shopify.com/s/files/1/0431/3504/1702/files/23678275977.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/b_arch_exam_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/5048/3368/files/ge_profile_arctica.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fenajowogotuxukat.pdf
    • https://cdn.shopify.com/s/files/1/0450/1300/8534/files/65744181385.pdf
    • https://cdn.shopify.com/s/files/1/0437/5104/7329/files/favuwotamadepusile.pdf
    • https://cdn.shopify.com/s/files/1/0432/5205/6227/files/kifilosumozenuwidunuta.pdf
    • https://cdn.shopify.com/s/files/1/0431/9304/1053/files/29283070371.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_off00008dc2.bin
c80d8dbad0b6baf3ac9c2656e452d27b04830431c200da8f4987c9bd3385ce9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC2 5240 bytes
font_01_sfnt_off00009fa4.bin
74f88d9e7c59e78f4854147eea4d05c2ab3d941e4df6f329bb2877ab6b11153c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FA4 10072 bytes
font_02_sfnt_off0000c20f.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC20F 4324 bytes

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