Malicious PDF — malware analysis report

Static analysis result for SHA-256 98197f70fb2fe12d…

MALICIOUS

PDF

40.2 KB Created: 2020-08-21 07:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 255cd3eba803a801051fe4d03f122411 SHA-1: ad3f0fb93ab312c43105dc50fbd12abd73c74da7 SHA-256: 98197f70fb2fe12d8a135bde8ebd5a63c65150124e1cc0c1b1f4c30424db165c
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which points to 'https://ttraff.cc/pify?keyword=certificate+templates+word+free'. This URL is likely used to redirect the user to a malicious site. The document also contains a large number of embedded links, many of which point to Shopify domains, suggesting a link farm or SEO poisoning attempt to improve the ranking of malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=certificate+templates+word+free
    • http://files.charbroilcatering.com/uploads/1/3/1/4/131406736/katijilebaja.pdf
    • http://files.teachingcello.com/uploads/1/3/2/6/132680813/tuzof.pdf
    • https://cdn.shopify.com/s/files/1/0428/3367/4396/files/faxugenabitokoziz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/livoxigugefeguvon.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7780/files/weekly_budgeting_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zukukujumifuxutage.pdf
    • https://cdn.shopify.com/s/files/1/0435/4372/4186/files/sovirorazusuj.pdf
    • https://cdn.shopify.com/s/files/1/0429/9689/1807/files/bazamoxaminop.pdf
    • https://cdn.shopify.com/s/files/1/0433/6097/7048/files/73081420286.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/49646140115.pdf
    • https://cdn.shopify.com/s/files/1/0434/2261/3669/files/6661571264.pdf
    • https://cdn.shopify.com/s/files/1/0435/7426/3963/files/61398988231.pdf
    • https://cdn.shopify.com/s/files/1/0437/0087/9510/files/bebufadajapuzabimo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8685/5840/files/lapobovetukuxuxin.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_off00005f8c.bin
11332842ad4df1bb77311e6ae2187fa87bbb1c188439b01fc20e2ceeaf6c626d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8C 5296 bytes
font_01_sfnt_off00007181.bin
2d88018feba6fb571d2d040ba792a82e37d6cab70fd09da6569e4eb96e138719
pdf-font-stream PDF embedded font (sfnt) at offset 0x7181 10632 bytes