Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb491bdb4f7c12c…

MALICIOUS

PDF

50.1 KB Created: 2020-08-12 10:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 509c2ba901a01cfbf2296cc7f08f0ad7 SHA-1: 1fd5e6d3a780b6f4049a763c82c8867f7732f0b7 SHA-256: 0cb491bdb4f7c12cd87b0b1346281c554743272907763abde8f81dd6b0e8abd4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.cc/pify?keyword=occupation+definition+pdf'. This suggests the document is part of a link farm or SEO poisoning campaign designed to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of embedded URLs and the redirector link strongly suggest a phishing or scam 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.cc/pify?keyword=occupation+definition+pdf
    • http://maruvu.carinamarino.com/uploads/1/3/0/7/130740597/5096533.pdf
    • http://xojuluzo.studentworshipcollective.com/uploads/1/3/0/7/130775934/xilulo.pdf
    • http://files.chicagoland4x5.org/uploads/1/3/2/7/132710743/2643545.pdf
    • http://tizixago.camplakeoutfitters.com/uploads/1/3/1/0/131070458/muzagosubipedu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9959313526.pdf
    • https://cdn.shopify.com/s/files/1/0433/2634/1272/files/gemisejadagesezef.pdf
    • https://cdn.shopify.com/s/files/1/0429/1313/6799/files/vinugiwufojoluremenatiji.pdf
    • https://cdn.shopify.com/s/files/1/0429/5789/7882/files/4850923116.pdf
    • https://cdn.shopify.com/s/files/1/0440/4156/8421/files/bazojixetumebofit.pdf
    • https://cdn.shopify.com/s/files/1/0434/7700/8548/files/69150226172.pdf
    • https://cdn.shopify.com/s/files/1/0437/4924/5079/files/voet_biochemistry_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/0107/7142/files/37539406714.pdf
    • https://cdn.shopify.com/s/files/1/0429/2483/4975/files/comment_assembler_des_sur_mac.pdf
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/automobile_technology_n_k_giri.pdf
    • https://cdn.shopify.com/s/files/1/0431/7485/4820/files/sanovaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/6706/4991/files/7906768099.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
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000690b.bin
7b690082871db61f2570917886fd84c51521e133a423c9ce6b8e9d3f9ee68300		 pdf-font-stream PDF embedded font (sfnt) at offset 0x690B 4868 bytes
font_01_sfnt_off000079a8.bin
6c01a180f368f57fca7b77f6f6ed36b8f0b93e5fc8518a3c60eaa908892f86e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79A8 6544 bytes
font_02_sfnt_off00008b0a.bin
b09ecb013ff447df87dd489dfeee82ed66b5a7c2bf78132c30fa2a59c26209c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B0A 15244 bytes

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