Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4df100140a92c2…

MALICIOUS

PDF

47.1 KB Created: 2020-04-12 06:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c90f2ce8b2196567a69d6d17c890aa86 SHA-1: d60b14fd981770c028503861e33f60046dc93908 SHA-256: 7f4df100140a92c2ea500ced75087281fd7c6cad3ec717c68a78317d257004f5
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to other PDF files hosted on unrelated domains. This behavior is indicative of a link farm or SEO spam campaign, designed to drive traffic or potentially host malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://aicamembers.org/uploads/1/3/1/1/131163533/131163533.html#appalachian+trail+thru+hikers+guide+pdf
    • http://michaelanthonytorres.com/uploads/1/3/0/6/130620758/ad332d92d42b5e.pdf
    • http://laptoprepairsstudio.com/uploads/1/3/0/7/130739816/6416052.pdf
    • http://americasmosthauntedneighborhood.com/uploads/1/3/0/2/130272557/tusiw_wevirige_sosaregiwosunon.pdf
    • http://newthemistocles.com/uploads/1/3/0/5/130543207/528f2321.pdf
    • http://islanddesires.net/uploads/1/3/0/9/130969663/1884877.pdf
    • http://paige-elizabeth-allen.com/uploads/1/3/0/3/130313241/5502250.pdf
    • http://eduplusafrica.net/uploads/1/3/0/4/130476538/litivopa.pdf
    • http://southbronxtours.com/uploads/1/3/0/8/130813948/12afe0b7b8.pdf
    • http://agence-mardy.com/uploads/1/3/0/5/130588783/a2953862b26174.pdf
    • http://tipforacure.com/uploads/1/3/0/7/130740025/684733.pdf
    • http://icqueens.org/uploads/1/3/1/1/131163996/fularegido-wifat-gedazuda-xopupapekoj.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008e85.bin
d21d99364f9ded3160f202cd4f8049a1df667ff02048e436f6830d514ac6fb49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E85 8844 bytes

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