Malicious PDF — malware analysis report

Static analysis result for SHA-256 9053d40d3d1ed314…

MALICIOUS

PDF

51.0 KB Created: 2020-07-27 05:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d92db3c4690512a646f50889b0642911 SHA-1: 41ede010276d12fc2b9001b7ea38dbb44d4282be SHA-256: 9053d40d3d1ed314e4a0be839f4eb50c77e68124ac8b8968c1e2c388db42dd82
152 Risk Score

Malware Insights

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

The PDF contains a lure related to an IT internship certificate, which is a common social engineering tactic. It embeds a large number of external links, with one critical heuristic firing indicating a malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to potentially harmful content via these embedded links.

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/pify?keyword=exemplaire+attestation+de+stage+en+informatique
    • http://files.greenmountaintreats.com/uploads/1/3/2/7/132740682/zevojasegilopimota.pdf
    • http://files.silveroceangroup.com/uploads/1/3/1/3/131383733/pugezezumix_lasuxebepo.pdf
    • http://files.atomlive.org/uploads/1/3/0/7/130740033/3623576bc2.pdf
    • https://cdn.shopify.com/s/files/1/0429/3869/5846/files/13272431640.pdf
    • https://cdn.shopify.com/s/files/1/0437/5989/4689/files/35165070599.pdf
    • https://cdn.shopify.com/s/files/1/0430/8054/8503/files/bodukeruriruxanalegepi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vewurobafug.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/55542454294.pdf
    • https://cdn.shopify.com/s/files/1/0429/9846/4661/files/xajodadelixusexoruzuk.pdf
    • https://cdn.shopify.com/s/files/1/0429/9862/8501/files/nidujufopejuzexoja.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/musigusuwekun.pdf
    • https://cdn.shopify.com/s/files/1/0439/4732/7646/files/mabutejoriwopat.pdf
    • https://cdn.shopify.com/s/files/1/0432/3550/8381/files/wojuxoj.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/rugujoredipe.pdf
    • https://cdn.shopify.com/s/files/1/0431/7665/7055/files/72831766108.pdf
    • https://cdn.shopify.com/s/files/1/0427/8878/2236/files/89865810625.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_off000083df.bin
097f4d7951a8bd864a3abe56bceeecc8d907831408aaf31834dedcf69ccb747c
pdf-font-stream PDF embedded font (sfnt) at offset 0x83DF 5396 bytes
font_01_sfnt_off00009618.bin
c04c619c95bfe834bc0f17a68263be2b6d370a5cebd0c91ed0a36ec8f1f8a86a
pdf-font-stream PDF embedded font (sfnt) at offset 0x9618 11988 bytes