Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a241d95561d809…

MALICIOUS

PDF

33.9 KB Created: 2020-08-21 12:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 371c2f165423f8adbbf14097430b183f SHA-1: 9d225e5c9d56f47467a2be8f8d06d6bfdd73b61a SHA-256: 95a241d95561d80999b018aed8ef06c4dc7f9e9df323843f5ee13e4ae98dd90a
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to domains associated with link farms and redirectors. The primary malicious URL, https://ttraff.com/pify?keyword=pearson+mymathlab+college+algebra+answers, is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to academic answers, suggesting a lure to trick users into clicking the malicious links. The ML classifier strongly flagged this PDF as malicious.

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=pearson+mymathlab+college+algebra+answers
    • http://lujejub.amandaglathlin.com/uploads/1/3/0/7/130776406/xudojonidekidugudeje.pdf
    • http://muzovo.moment-of-clarity.org/uploads/1/3/0/7/130775370/948876.pdf
    • http://rekepi.oto-saigon.com/uploads/1/3/2/3/132303382/3070740.pdf
    • http://waxoseguk.danmarinocards.com/uploads/1/3/0/7/130739964/guzijelebijomudejon.pdf
    • http://kanul.expresschurchofy.com/uploads/1/3/1/6/131636825/kuvopumaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/21588616583.pdf
    • https://cdn.shopify.com/s/files/1/0431/6895/6565/files/boss_dd3_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/3426/3199/files/36625027083.pdf
    • https://cdn.shopify.com/s/files/1/0430/0737/7567/files/desatexebikaganufi.pdf
    • https://cdn.shopify.com/s/files/1/0446/8460/7641/files/byomkesh_o_agniban_link.pdf
    • https://cdn.shopify.com/s/files/1/0431/4795/2292/files/71279196161.pdf
    • https://cdn.shopify.com/s/files/1/0430/6160/8599/files/nedilasekobapofobubutala.pdf
    • https://cdn.shopify.com/s/files/1/0439/0633/4888/files/luvok.pdf
    • https://cdn.shopify.com/s/files/1/0429/3676/2527/files/2827410423.pdf
    • https://cdn.shopify.com/s/files/1/0427/8091/7926/files/24154813383.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5912/files/mexerosowow.pdf
    • https://cdn.shopify.com/s/files/1/0435/5706/0769/files/64924118364.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_off000045f1.bin
361ef48e9056e27df0002c95a34a4baf9b93b91b117cd923115d6087643cd351		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45F1 5548 bytes
font_01_sfnt_off000058b6.bin
c5025f91b5fe7577880af78572874178d0949108cf519a5a760501d7e4cd00be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58B6 9968 bytes

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