Malicious PDF — malware analysis report

Static analysis result for SHA-256 baaddd6a24511c1b…

MALICIOUS

PDF

41.5 KB Created: 2020-08-10 01:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c65181906b3b7d7324b1e2361f59f48b SHA-1: 05452493f14fbfd5b213888879aa2d875d850e56 SHA-256: baaddd6a24511c1bb34a0373032f41f6a45838615484a9a78763c23835b4c0d1
152 Risk Score

Malware Insights

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

The PDF contains a direct link to a known malicious redirector, ttraff.com, disguised as a helpful guide. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for users searching for specific information, likely to drive traffic to malicious sites. The presence of numerous Shopify links, some benign and some pointing to potentially malicious content, suggests a link farm or SEO poisoning tactic.

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=change+font+size+kindle+paperwhite+pdf
    • http://mepigug.konrn.com/uploads/1/3/2/8/132814930/c36bf8581e19f6.pdf
    • http://files.finksdeli.org/uploads/1/3/2/7/132741222/5b0259.pdf
    • http://files.llmadridmakesthingsup.com/uploads/1/3/1/8/131871740/7572731.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/padobi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2885/6487/files/4x12_lean_to_shed_plans_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/biochemistry_and_molecular_biology_william_h._elliott.pdf
    • https://cdn.shopify.com/s/files/1/0431/8520/9506/files/pmbok_5th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/3398/4162/files/56329642017.pdf
    • https://cdn.shopify.com/s/files/1/0432/8806/8254/files/33310983517.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2906/files/syntactical_stylistic_devices.pdf
    • https://cdn.shopify.com/s/files/1/0430/0675/4970/files/way_back_into_love_piano.pdf
    • https://cdn.shopify.com/s/files/1/0431/3301/0082/files/sedunebuxodap.pdf
    • https://cdn.shopify.com/s/files/1/0437/9472/7074/files/gawezoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/4556/0219/files/86009775355.pdf
    • https://cdn.shopify.com/s/files/1/0432/4114/4483/files/three_syllable_words_list.pdf
    • https://cdn.shopify.com/s/files/1/0429/5432/6179/files/dumakutojobitobobexuro.pdf
    • https://cdn.shopify.com/s/files/1/0439/0807/1576/files/54507018612.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_off0000629d.bin
b1a6cdf575483dc58337147c2bc5465e11eeb99f58c665eb0c41ceed690e86ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x629D 5412 bytes
font_01_sfnt_off00007521.bin
dd17288b93fe8f71dc27274525d4ef5cd71407a5760e77869be7e48ad5b973b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7521 10420 bytes

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