Malicious PDF — malware analysis report

Static analysis result for SHA-256 6806f9b38bd52a27…

MALICIOUS

PDF

36.9 KB Created: 2020-08-10 13:40:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df16a124eb45fc3c5188c4bd45aeb0d1 SHA-1: 60b2f21ef389a75fff5a66f20ccd197d486e84f7 SHA-256: 6806f9b38bd52a27aaa01d8f8164609bfcae935285b5a9f1d5cd0944210a1c9b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and contains a large number of embedded links, many pointing to external PDF files. One of these links, https://ttraff.com/pify?keyword=anemia+megaloblastica+epidemiologia+pdf, is known to lead to malicious redirector infrastructure. The document's structure suggests it is part of a link farm or SEO manipulation scheme, potentially used to distribute malware or phish for information.

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=anemia+megaloblastica+epidemiologia+pdf
    • http://files.mohamedalkhoori.com/uploads/1/3/1/0/131070618/9777421.pdf
    • http://sewik.candlewyckhomes.com/uploads/1/3/0/8/130813765/2438796.pdf
    • http://files.qtaxservices.com/uploads/1/3/0/7/130776100/93ad73aeec25.pdf
    • http://files.girlpowerblogs.com/uploads/1/3/2/6/132681824/vavezot_xijeliz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0448/3993/files/vodepolojavuzagatabifu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9979/1268/files/vafepo.pdf
    • https://cdn.shopify.com/s/files/1/0440/4844/9701/files/cfe_exam_prep_course.pdf
    • https://cdn.shopify.com/s/files/1/0432/0264/2075/files/96728247334.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/25032464023.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mijafovaginidobu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6277/1366/files/sedimaxufodevopaman.pdf
    • https://cdn.shopify.com/s/files/1/0431/0486/2374/files/55465134679.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/90442425312.pdf
    • https://cdn.shopify.com/s/files/1/0436/5228/4566/files/57877979363.pdf
    • https://cdn.shopify.com/s/files/1/0439/4103/6200/files/calculus_a_complete_course_second_edition.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000052a8.bin
c99db1be850446c62eeacab51bb3a7d89364c5b19333b4ead7c564f5b9eec206
pdf-font-stream PDF embedded font (sfnt) at offset 0x52A8 5508 bytes
font_01_sfnt_off00006546.bin
0afdae1d7e1bbf88bbb4408ba9b93d42cbc868b81cf4a8218de8598b77f1f14d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6546 9756 bytes