Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bac699eba02719b…

MALICIOUS

PDF

35.2 KB Created: 2020-08-09 20:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35b1711dd683d694ae1a3bfb2269c333 SHA-1: c9834b4051eb69da7af6a47ca150c150c2f9b6f8 SHA-256: 4bac699eba02719b4937e0dc8a2d87aad461d0a84a8167ffbdb8565ad45fcbd8
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains numerous embedded URLs. One URL, https://ttraff.ru/pify?keyword=antimicrobial+activity+of+carica+papaya+pdf, is identified as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and a list of other URLs hosted on cdn.shopify.com and other domains, suggesting a link farm or redirection scheme designed to lead users to 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.ru/pify?keyword=antimicrobial+activity+of+carica+papaya+pdf
    • http://files.talesfromawargameshed.com/uploads/1/3/1/0/131071035/4942229.pdf
    • http://files.illustratebrandz.com/uploads/1/3/1/4/131437513/e82490c.pdf
    • http://duxogow.heavenyes.net/uploads/1/3/1/6/131606289/030e4.pdf
    • https://cdn.shopify.com/s/files/1/0432/2761/1295/files/zobujavo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0455/8488/files/males_of_skyrim.pdf
    • https://cdn.shopify.com/s/files/1/0433/7706/6135/files/10382122683.pdf
    • https://cdn.shopify.com/s/files/1/0427/4031/8375/files/79750620588.pdf
    • https://cdn.shopify.com/s/files/1/0434/6245/9544/files/50114054127.pdf
    • https://cdn.shopify.com/s/files/1/0429/3437/0470/files/fuxasisenewemomujakudid.pdf
    • https://cdn.shopify.com/s/files/1/0429/2709/5967/files/xusiwakevuxexapo.pdf
    • https://cdn.shopify.com/s/files/1/0440/3914/3574/files/guzopovofavuwipokewup.pdf
    • https://cdn.shopify.com/s/files/1/0436/9163/8934/files/what_is_a_weebo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5485/7369/files/rulapifuvosado.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/supewatovojipavebel.pdf
    • https://cdn.shopify.com/s/files/1/0428/1024/5279/files/71496475403.pdf
    • https://cdn.shopify.com/s/files/1/0436/1909/0595/files/united_nations_2020_agenda_for_sustainable_development.pdf
    • https://cdn.shopify.com/s/files/1/0432/9121/3988/files/dejizodasakabuselox.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_off000048e6.bin
a518d3760263d902a91bedad813f2044a858757101ee02ccc91473379387ae71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48E6 5412 bytes
font_01_sfnt_off00005b49.bin
c189c55afa9da16f297e7d50e9d83df8577eff3d1e1ecb758abea1494edd1542		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B49 10116 bytes

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