Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e7c16e425defa5…

MALICIOUS

PDF

37.8 KB Created: 2020-08-06 09:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e767ee7601ab0f73eea03a2901c8229 SHA-1: e923c14c9925043f937e879a34253262c4f26aa8 SHA-256: 40e7c16e425defa52439a7499bdd5e5ee9d0920e802aa41837c91e6f9abc687c
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting it is a 'solutions manual' and includes the malicious URL. This indicates a social engineering attempt to trick users into visiting a harmful site, likely for further exploitation or malware delivery.

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=mathematics+for+economics+student+solutions+manual+pdf
    • http://files.bedayatlifecoaching.com/uploads/1/3/0/7/130738841/226e77e11779e.pdf
    • http://files.just-beecause.com/uploads/1/3/0/8/130874213/6ed0e49f.pdf
    • http://files.kathrynmwhitesel.com/uploads/1/3/0/7/130739590/bolosubuzax.pdf
    • https://cdn.shopify.com/s/files/1/0430/9070/6589/files/97058165773.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3360/files/17930058138.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/87294010080.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/barron_s_gre_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/9928/3863/files/45680708947.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6537/files/83104639671.pdf
    • https://cdn.shopify.com/s/files/1/0434/0675/3948/files/87379112520.pdf
    • https://cdn.shopify.com/s/files/1/0429/1543/0559/files/636984870.pdf
    • https://cdn.shopify.com/s/files/1/0430/7222/5442/files/87809681428.pdf
    • https://cdn.shopify.com/s/files/1/0431/7115/2023/files/maxaxinuvawozoduxafifox.pdf
    • https://cdn.shopify.com/s/files/1/0431/7505/1424/files/78609811596.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_off00005549.bin
a55eb4b9734288e18c4a4ebc2d9256137b7ac088ff71975e59a9def91740dea0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5549 5400 bytes
font_01_sfnt_off0000678c.bin
589660878dd5ffffb078c7bd72d1af2fceba6596fda0db0cc71b367f123f7948
pdf-font-stream PDF embedded font (sfnt) at offset 0x678C 10108 bytes