Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f807bf01470b8c…

MALICIOUS

PDF

58.6 KB Created: 2020-08-14 02:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6e08a3b6fb35224c109d196afa120fd SHA-1: 5b22cd3b41ba4231c6da13a29592129ad538fe6d SHA-256: 99f807bf01470b8cafc570a4541001e045ede4b739ebe398c15e3d900f7eb3cf
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with at least one identified as a malicious redirector (ttraff.cc). The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting the primary intent is to lure users to this external resource. The presence of a link farm further supports the attack pattern of redirecting users to potentially harmful content.

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=creature+3d+all+song+ming
    • http://kuwuvan.trulloneglialberi.com/uploads/1/3/2/6/132681670/vojorupifodej.pdf
    • http://files.myfathershouseworcester.org/uploads/1/3/1/3/131379946/11d7caa3fa294d.pdf
    • http://files.sachagrosselart.com/uploads/1/3/0/9/130969209/belizifimekedaxuwuzu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3800/6686/files/15256548872.pdf
    • https://cdn.shopify.com/s/files/1/0430/0167/5939/files/synonyms_and_antonyms_exercises_for_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0428/9812/9059/files/kabulupixedawavitof.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4242/files/alcoois_e_fenois.pdf
    • https://cdn.shopify.com/s/files/1/0429/1071/1971/files/68030289709.pdf
    • https://cdn.shopify.com/s/files/1/0430/1763/3949/files/vumezagadosin.pdf
    • https://cdn.shopify.com/s/files/1/0431/8137/5648/files/mejuraw.pdf
    • https://cdn.shopify.com/s/files/1/0427/5293/4044/files/damevuzofilikoro.pdf
    • https://cdn.shopify.com/s/files/1/0429/9807/1449/files/nanusexapuwumi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2252/3288/files/rekafu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/jefusilinelixa.pdf
    • https://cdn.shopify.com/s/files/1/0438/0409/8722/files/68581434929.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/taniseraguvifololesugom.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_off00009e33.bin
a23ab3a744a05178b5210fd79d182b92ab54d6d6be675e79b1f0353846c32bd7
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E33 5212 bytes
font_01_sfnt_off0000afd0.bin
a784c332f3beb6746465bf330c9e732c279c8051db2114d582c18ca7bf43c4ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD0 15180 bytes