Malicious PDF — malware analysis report

Static analysis result for SHA-256 19fd4c2a8529d795…

MALICIOUS

PDF

39.9 KB Created: 2020-08-30 20:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 243d8fecfa1c9f3a3703d1fb42d8f0d4 SHA-1: 01d37825e2543490424086cc6107dc09c33edf23 SHA-256: 19fd4c2a8529d7953d592433d6bc9a9820557ab554c1e79e13cff40c64034a59
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a direct link to a known malicious redirector, ttraff.cc, which is likely intended to lead the user to a phishing or malware distribution site. The document body, though heavily obfuscated, contains the target URL and appears to be a lure related to tobacco pricing. The presence of a large number of external PDF links also suggests a link farm, potentially for SEO poisoning or to obscure the malicious redirector.

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=precio+tabaco+california
    • https://static.usrfiles.com/ugd/b8c837_56651e16c1894a7dbea5127926c6d992.pdf
    • https://static.usrfiles.com/ugd/576447_8b74048f901045bf8a1e35439dac7731.pdf
    • https://static.usrfiles.com/ugd/136d07_c8406a634cb44f4c80c081f05ab420a2.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/nebor.pdf
    • https://cdn.shopify.com/s/files/1/0437/5347/2151/files/tixudexixateku.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/novorubafiwani.pdf
    • https://cdn.shopify.com/s/files/1/0434/5479/1846/files/95393178172.pdf
    • https://static.usrfiles.com/ugd/b8c837_f00786febb774dfcb39f79a1bc40f0bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a3ecd10e2ae41c4a38f2cb00ddd1fec.pdf
    • https://static.usrfiles.com/ugd/b8c837_07c683f01f4c44509e102f304d117095.pdf
    • https://static.usrfiles.com/ugd/b8c837_f68bb4c00cd64a19912674786f0f43a7.pdf
    • https://cdn.shopify.com/s/files/1/0432/5592/2856/files/zotevokudujunegovu.pdf
    • https://cdn.shopify.com/s/files/1/0438/9991/2344/files/44348195779.pdf
    • https://cdn.shopify.com/s/files/1/0434/8484/0089/files/jnc_8_hypertension_guidelines_2017.pdf
    • https://cdn.shopify.com/s/files/1/0431/9199/2481/files/20057890193.pdf
    • https://cdn.shopify.com/s/files/1/0433/9613/7111/files/real_book.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_off00005c15.bin
f0ba680c405573105d797551c1adf4796eef0dd520bf67dff2e13336025faee8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C15 4840 bytes
font_01_sfnt_off00006c91.bin
7cf541108838d41be7732c7328cde5ca60f870d3c2c0d469eabdfe53e0859c69
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C91 11304 bytes