Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f034cdbf9f756e…

MALICIOUS

PDF

39.9 KB Created: 2020-08-25 12:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d816327d6206b3899e41a5bcee0d83b1 SHA-1: f622060432128f441abf67297978e4e9b3aa4a65 SHA-256: c1f034cdbf9f756e66cf73c6761deb0f2a3222c0c12bb0f7159e35132f55103b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though partially corrupted, contains the text 'Conjunction worksheet for class 5' and the malicious URL, suggesting a lure to trick users into clicking the malicious link. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm, often used for SEO poisoning or distributing 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.cc/pify?keyword=conjunction+worksheet+for+class+5
    • http://files.walleysbookreviews.com/uploads/1/3/0/7/130740551/topumogiv-lafimedoburaz.pdf
    • http://files.hloc.org/uploads/1/3/1/6/131608016/penemutibiji.pdf
    • http://xipid.oxnardwirelessrepairs.com/uploads/1/3/1/4/131453832/vujiwupedaj-niradu-nobamodogas-vegepevalale.pdf
    • https://cdn.shopify.com/s/files/1/0436/9081/9739/files/24447870517.pdf
    • https://cdn.shopify.com/s/files/1/0431/3602/4737/files/loha_movie_full_hd.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9345/files/63561620902.pdf
    • https://cdn.shopify.com/s/files/1/0431/5152/4008/files/72830791038.pdf
    • https://cdn.shopify.com/s/files/1/0434/0675/3948/files/vipigefejiwebesudimifa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93336639176.pdf
    • https://cdn.shopify.com/s/files/1/0436/3167/3504/files/bose_soundlink_colour_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/2172/9955/files/ritudixaferoboridanobeved.pdf
    • https://cdn.shopify.com/s/files/1/0435/0191/2224/files/35237412714.pdf
    • https://cdn.shopify.com/s/files/1/0432/7342/0965/files/alejandro_magno_biografa.pdf
    • https://cdn.shopify.com/s/files/1/0433/7133/1742/files/nortel_phone_manual.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_off00005ed6.bin
a376a57e46ad327fa7cd04a329cafaf1cbd312b26834dbc344bfe28d52d1c63a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED6 5232 bytes
font_01_sfnt_off000070b9.bin
89285eb0ba4979ea5919bcde509a72848838204940ffdaf239ca561fca8a614e
pdf-font-stream PDF embedded font (sfnt) at offset 0x70B9 10004 bytes