Malicious PDF — malware analysis report

Static analysis result for SHA-256 acdce1b16f1d46ca…

MALICIOUS

PDF

45.7 KB Created: 2020-08-25 05:40:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9d2250b8b8a3552dd352604c9fbbc81 SHA-1: 37d78ab442ea34b44973038769c787fa75c11b47 SHA-256: acdce1b16f1d46cad37c26374e2e02fe7a22fce61f5013bc64f075b0c6fcc82d
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains numerous embedded links. One prominent link, 'https://ttraff.com/pify?keyword=solid+waste+management+ppt+presentation', leads to a known malicious redirector. The document also features a large number of external PDF links, many hosted on Shopify, suggesting an attempt to create a link farm for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the primary attack vector appears to be the redirection through the embedded malicious URL.

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=solid+waste+management+ppt+presentation
    • http://wapini.nycridingacademy.org/uploads/1/3/0/8/130874493/ramikom-wariwizidava-gakufi-juvipolu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6829/3287/files/wondershareelement_blogspot.pdf
    • https://cdn.shopify.com/s/files/1/0433/7431/3621/files/47398632306.pdf
    • https://cdn.shopify.com/s/files/1/0437/6395/7909/files/26072803210.pdf
    • https://cdn.shopify.com/s/files/1/0433/0756/5209/files/laximiwokakumumomi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1077/6478/files/big_ideas_math_algebra_1_answers.pdf
    • https://cdn.shopify.com/s/files/1/0440/1269/9798/files/bbd_ka_full_form_kya_hai.pdf
    • https://cdn.shopify.com/s/files/1/0432/5477/5970/files/rarak.pdf
    • https://cdn.shopify.com/s/files/1/0435/3461/4688/files/98692400840.pdf
    • https://cdn.shopify.com/s/files/1/0430/2720/2205/files/70272867031.pdf
    • https://cdn.shopify.com/s/files/1/0439/7678/6078/files/putuwe.pdf
    • https://cdn.shopify.com/s/files/1/0438/7520/5288/files/23247458297.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bbf.bin
5d53bb52bbad0c9c2a945120f3815651915eca8e4a0c41f7163aaf4756ad3149
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BBF 1584 bytes
font_01_sfnt_off000073c7.bin
318ac4d487c58d30c957cc4c353da38e4cb0b4192fa4c34aa9baeb6866416b4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x73C7 5472 bytes
font_02_sfnt_off00008660.bin
c50352cf68911467a286322cdf7b80c045264e6b2632124164bd3b3d50960ba7
pdf-font-stream PDF embedded font (sfnt) at offset 0x8660 10304 bytes