Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ecd47566f3f22d…

MALICIOUS

PDF

41.3 KB Created: 2020-08-14 00:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19ce7903e363a74b94432c0188f090e7 SHA-1: cc19a9592a98ea51cfe4ce4955401b928fc4492e SHA-256: 91ecd47566f3f22de6e5e77382e5f894687558af7a48d0142ef8a3fd0339270d
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and embedded URLs, including a primary redirector at https://ttraff.com/pify?keyword=lonesome+train+gig+guide, which likely leads to a malicious site. The large number of embedded links suggests a broad distribution attempt.

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=lonesome+train+gig+guide
    • http://files.baroverbar.com/uploads/1/3/2/6/132682295/wedukeku.pdf
    • http://bofopeg.ogdenvalleyevent.com/uploads/1/3/0/9/130969352/lomojazoxerab.pdf
    • http://zixafiso.thebodyserve.com/uploads/1/3/1/4/131437423/2ec68c7480e8c0.pdf
    • http://files.innerartscollective.com/uploads/1/3/1/0/131069992/181e1550a8f08ae.pdf
    • http://ninile.ccrgames.com/uploads/1/3/0/9/130968984/2674c0dad4206.pdf
    • https://cdn.shopify.com/s/files/1/0436/1263/5299/files/sivutuvodupediveb.pdf
    • https://cdn.shopify.com/s/files/1/0437/6687/4266/files/amelia_bedelia_books.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1042/files/raxosexasobur.pdf
    • https://cdn.shopify.com/s/files/1/0438/9899/4856/files/tukoxewuvi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4646/9793/files/36144984193.pdf
    • https://cdn.shopify.com/s/files/1/0435/4313/4362/files/peter_brown_augustine_of_hippo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2808/5912/files/susajiropu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/78348637187.pdf
    • https://cdn.shopify.com/s/files/1/0435/3346/7808/files/domefusemom.pdf
    • https://cdn.shopify.com/s/files/1/0437/1555/9573/files/free_sublease_agreement_template_word_ontario.pdf
    • https://cdn.shopify.com/s/files/1/0439/6164/7262/files/48154919375.pdf
    • https://cdn.shopify.com/s/files/1/0435/0712/2342/files/limemivogojufimixa.pdf
    • https://cdn.shopify.com/s/files/1/0428/1974/7999/files/xodevekenerojukavejow.pdf
    • https://cdn.shopify.com/s/files/1/0427/9438/5575/files/lupupaxaguzegapumu.pdf
    • https://cdn.shopify.com/s/files/1/0438/3247/5798/files/56572647623.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005736.bin
b61a1d64c569bc64f597c546595c48e11759885d9814a628cab014003cc2fb28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5736 4936 bytes
font_01_sfnt_off000067de.bin
2e5353a5362e72ad122cb71aa83eb0dce80138363160593349e16db7b4262ed8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67DE 10004 bytes
font_02_sfnt_off00008a0d.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A0D 4324 bytes

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