Malicious PDF — malware analysis report

Static analysis result for SHA-256 786a8aa1c883749d…

MALICIOUS

PDF

32.4 KB Created: 2020-08-22 22:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ed6f8f2851bb52bec58918e437c6cdf SHA-1: 44635e3b787a65071aaacd040badbcc236285a3c SHA-256: 786a8aa1c883749d5e5f9313a540acb2138b6056b75e2d0239ac9d158ad9229a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or SEO link farms. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL https://ttraff.com/pify?keyword=barsataan+lakhwinder+wadali+video+song as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to drive traffic to malicious sites.

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.com/pify?keyword=barsataan+lakhwinder+wadali+video+song
    • http://pefolix.machine-analytics.com/uploads/1/3/0/8/130813840/lafirodupadapaxoda.pdf
    • http://files.quranicframework.com/uploads/1/3/0/7/130738720/1313650.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6690/8065/files/lupuluvobonapafopevuriwu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0409/9740/files/git_branching_model.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/19194700937.pdf
    • https://cdn.shopify.com/s/files/1/0432/3577/0532/files/minecraft_servers_pe_0._12._1.pdf
    • https://cdn.shopify.com/s/files/1/0428/6713/0534/files/17995997968.pdf
    • https://cdn.shopify.com/s/files/1/0437/6123/8168/files/dupedimanilonotisi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9189/4176/files/kanuzenozup.pdf
    • https://cdn.shopify.com/s/files/1/0430/8035/1897/files/if_element_is_out_of_viewport.pdf
    • https://cdn.shopify.com/s/files/1/0431/1190/7488/files/78141194023.pdf
    • https://cdn.shopify.com/s/files/1/0431/1800/2340/files/9715300335.pdf
    • https://cdn.shopify.com/s/files/1/0429/2925/8649/files/boss_me_80_owner_s_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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004136.bin
99774c7109e698fe2dece0844bc107318b59ad49d80d5e0fa78df6d20f087d76
pdf-font-stream PDF embedded font (sfnt) at offset 0x4136 5352 bytes
font_01_sfnt_off0000537d.bin
9cdc148b8615fb94b3c433b06532170ef20c2d20fe7b705b1498459f7d21df79
pdf-font-stream PDF embedded font (sfnt) at offset 0x537D 9812 bytes