Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2b77da23c3b7f5…

MALICIOUS

PDF

39.4 KB Created: 2020-08-31 14:39:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27af4c2b17771cdd0cc1d190f50b4611 SHA-1: 2a488beee4c391bcda735095dc8f995203310362 SHA-256: 8a2b77da23c3b7f5eb4b574bf42f7491ffde8cb0f70072d565b9e7807604ffaa
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to Shopify domains hosting other PDFs. One critical heuristic firing indicates a malicious redirector link to 'ttraff.cc', suggesting a redirection chain to malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated but contains the 'ttraff.cc' URL and other Shopify links, reinforcing the link farm and redirection attack pattern.

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/wix?keyword=swagger+editor++ubuntu
    • https://cdn.shopify.com/s/files/1/0439/2943/6315/files/kusitefamusumimuzasi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3318/2886/files/rezezapo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9856/1959/files/cara_membuat_cv_di_word_android.pdf
    • https://static.usrfiles.com/ugd/bf0735_ff67e5d61c954736bbfd98680d4c597c.pdf
    • https://static.usrfiles.com/ugd/fbccce_b47514dceed345aba231deb998cdb9d8.pdf
    • https://static.usrfiles.com/ugd/5ed537_f431458b2ead49a881e409d40017614e.pdf
    • https://cdn.shopify.com/s/files/1/0432/1371/7662/files/binifalobeba.pdf
    • https://cdn.shopify.com/s/files/1/0435/8779/7155/files/math_worksheets_expanded_form_to_standard_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/4777/9478/files/jekagoravekovu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5300/7526/files/dance_video_song_sharechat.pdf
    • https://cdn.shopify.com/s/files/1/0431/0210/9856/files/dictionnaire_technique_du_petrole_anglais_francais.pdf
    • https://cdn.shopify.com/s/files/1/0433/4888/5662/files/26680131733.pdf
    • https://cdn.shopify.com/s/files/1/0435/6784/1443/files/gifimosoloxawubepide.pdf
    • https://cdn.shopify.com/s/files/1/0432/0120/0288/files/clarinet_quartet_sheet_music.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_off00005cfc.bin
3d3c68d21dcba91c8605cca203fa46fa92f6a48978fd19bef8690d3b4ff213fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CFC 5120 bytes
font_01_sfnt_off00006e88.bin
5ffa041a860aa7e66dbbe4ef87f6e668fdbabc031ac6153fc83129905beff4de
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E88 10128 bytes