Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c2b115296eac57…

MALICIOUS

PDF

44.6 KB Created: 2020-08-03 12:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fda43dd9229aae0172e85687d021c449 SHA-1: c384e423a393cc115aefc0775ca7711bdfcddbe2 SHA-256: 16c2b115296eac57646259dd389b74d00556502cd63e42011b55da0d7a31db04
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one heuristic specifically identifying it as a "PDF SEO Link Farm". The primary malicious URL, `https://ttraff.ru/wb?keyword=conflict%20mediation%20process%20pdf`, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to these URLs, suggesting an attempt to drive traffic to potentially harmful sites.

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.ru/wb?keyword=conflict%20mediation%20process%20pdf
    • http://files.ameliahamiltonfit.com/uploads/1/3/0/7/130740429/7987861.pdf
    • http://files.girlwiththeflowertattoo.com/uploads/1/3/1/4/131438008/9b0b972a.pdf
    • http://files.radicallyawakenedmasters.com/uploads/1/3/1/6/131636914/rixitazemosiko_xesoxatol_rofebepotuluze_jikukolufog.pdf
    • http://files.honey-land.eu/uploads/1/3/2/7/132740445/pozikesumajitu-xiluno.pdf
    • http://kilexej.way2heal.com/uploads/1/3/1/3/131380126/2582977.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7375/7603/files/85601875626.pdf
    • https://cdn.shopify.com/s/files/1/0428/0087/3631/files/61163854122.pdf
    • https://cdn.shopify.com/s/files/1/0432/7519/0430/files/sodiwakiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/2814/2501/files/82588368758.pdf
    • https://cdn.shopify.com/s/files/1/0431/8344/0030/files/94187330298.pdf
    • https://cdn.shopify.com/s/files/1/0431/6302/5567/files/95883719931.pdf
    • https://cdn.shopify.com/s/files/1/0428/2528/5798/files/98273938077.pdf
    • https://cdn.shopify.com/s/files/1/0440/3019/7925/files/nsfw_subreddit_list.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8577/files/pafevofezofi.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007149.bin
6b3f876b26743f9726704b94ad531a801c718a8198eb65acadd0638f892b929f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7149 5208 bytes
font_01_sfnt_off000082e3.bin
f061b40f4a75617da42097e983e9b47163d5b0e87e3e09a78bc7cd5b5dc58a6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x82E3 10232 bytes