Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea9a3c6f4836bab…

MALICIOUS

PDF

41.4 KB Created: 2020-08-26 04:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2c7c506a07aba6bc21a6cbbbd2552e0 SHA-1: f380a728471fb72a1d431d2a0654f35f7975ba3e SHA-256: 6ea9a3c6f4836bab51bd5555d84a397932d93d35947a312e8315a79abda87af5
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, which is indicative of a link farm or SEO poisoning attempt. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=inductive+reasoning+example+in+daily'. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous external links suggests an attempt to drive traffic to malicious sites or distribute further payloads.

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=inductive+reasoning+example+in+daily
    • http://files.goodshepherdkearney.org/uploads/1/3/2/7/132710690/526967.pdf
    • http://files.recovery-counseling.com/uploads/1/3/2/7/132740267/kanaji.pdf
    • http://files.freygeospatial.com/uploads/1/3/0/8/130813931/3433041.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5756/9176/files/kitelosesawagilugeze.pdf
    • https://cdn.shopify.com/s/files/1/0434/8307/0629/files/kotezolixiwirag.pdf
    • https://cdn.shopify.com/s/files/1/0435/2311/3119/files/drowned_city_of_skalla.pdf
    • https://cdn.shopify.com/s/files/1/0431/8606/1463/files/3765115405.pdf
    • https://cdn.shopify.com/s/files/1/0447/5063/5162/files/video_downloadhelper_firefox.pdf
    • https://cdn.shopify.com/s/files/1/0437/7808/0925/files/htaccess_cache_control.pdf
    • https://cdn.shopify.com/s/files/1/0439/1829/5195/files/budget_planning_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/8637/9160/files/13855904187.pdf
    • https://cdn.shopify.com/s/files/1/0437/5658/5111/files/lexekilopese.pdf
    • https://cdn.shopify.com/s/files/1/0431/8363/6644/files/32896364915.pdf
    • https://cdn.shopify.com/s/files/1/0430/7088/1946/files/75789503111.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_off000063a7.bin
abf8c55daf4b9f6fd69e05b0ec423bb0547c50f49c0edb5c9c1bd61d61cd82c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x63A7 5560 bytes
font_01_sfnt_off00007683.bin
9aa4f5e899ef5b229ddf0324b481d8562f6042e3c7e9b324378c37289bf966fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7683 9996 bytes