Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe50b83404b373f3…

MALICIOUS

PDF

43.0 KB Created: 2020-08-12 15:39:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 248f374d55fb8bb7bd61c1580dc09b8f SHA-1: 808b429e48f3932522877dbf1f6cc162859c597b SHA-256: fe50b83404b373f3bf7aa12b74d239bc8d51be6143fda4de2e51a69566f29abe
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though partially garbled, includes text related to 'operational amplifiers with linear integrated circuits 4th edition pdf' and the malicious URL, suggesting a lure. Additionally, numerous links to Shopify domains were found, many of which are likely part of a link farm to improve SEO for 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.com/pify?keyword=operational+amplifiers+with+linear+integrated+circuits+4th+edition+pdf
    • http://files.566westadams.com/uploads/1/3/1/8/131857540/764da.pdf
    • http://files.boxbororegency.com/uploads/1/3/2/6/132681544/473272.pdf
    • http://files.abprecisionelectric.com/uploads/1/3/1/6/131637385/a01ba7d4.pdf
    • http://kokekase.theexeterinn.com/uploads/1/3/2/3/132303035/bobalivosetetid_wusifa_xunoloja.pdf
    • https://cdn.shopify.com/s/files/1/0433/6890/6906/files/caries_detection_dyes.pdf
    • https://cdn.shopify.com/s/files/1/0434/3113/3351/files/dependent_prepositions_test.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gabagijujusudizal.pdf
    • https://cdn.shopify.com/s/files/1/0429/4855/9004/files/tibefimewavixesefapitupom.pdf
    • https://cdn.shopify.com/s/files/1/0430/5525/1605/files/bissell_proheat_parts.pdf
    • https://cdn.shopify.com/s/files/1/0436/1460/1378/files/tozodudasulodanon.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jewaxepolirabosumasedud.pdf
    • https://cdn.shopify.com/s/files/1/0434/7707/4086/files/najuforosinijarukufij.pdf
    • https://cdn.shopify.com/s/files/1/0430/5335/1066/files/50_challenging_algebra_problems_fully_solved.pdf
    • https://cdn.shopify.com/s/files/1/0437/3187/8049/files/malayalam_devotional_songs_lyrics_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/5569/3470/files/43748440772.pdf
    • https://cdn.shopify.com/s/files/1/0431/2095/1450/files/49057949041.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006181.bin
d74d80fefd290cd57a5122676909af330212b4dac311bcd529786946e2f90c45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6181 5776 bytes
font_01_sfnt_off00007510.bin
1b435124f6e6fe780aa4c393fbd098bb29c673eb341f22024eb15e4369ec4e46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7510 12944 bytes

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