Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b557e9578d2a5ee…

MALICIOUS

PDF

47.4 KB Created: 2020-09-05 22:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95648c9fd19b03762ae3b3976adf10a3 SHA-1: ebb10156e595b75196af82b46594a3225ab68345 SHA-256: 9b557e9578d2a5ee2cd1f7b07f9d92a50c968674eba09e8333547c2d3b0908de
120 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.com, disguised with a keyword related to educational content. This heuristic indicates a phishing or social engineering attempt. The document body, though heavily corrupted, contains the same URL and references to educational worksheets, reinforcing the lure. The presence of numerous other links to static.usrfiles.com suggests a link farm or content distribution network used to host the malicious content.

Heuristics 3

  • 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.
  • 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/wix?keyword=long+division+worksheets+for+10+year+olds
    • https://static.usrfiles.com/ugd/48f461_276893600aa043838924970a2b3cb410.pdf
    • https://static.usrfiles.com/ugd/18f527_9441ebc2de5e4a0d89880b551a8df145.pdf
    • https://static.usrfiles.com/ugd/81d6a4_9b36c6f8b7b64a1b8623c59558ffc399.pdf
    • https://static.usrfiles.com/ugd/b8c837_624098937c8848638727b0fa276830b5.pdf
    • https://static.usrfiles.com/ugd/704566_6b3eaf3a091940be89131da328224e2e.pdf
    • https://static.usrfiles.com/ugd/82d61e_67b475050fd5444dbe7cdad0b3f9bc98.pdf
    • https://static.usrfiles.com/ugd/18f527_e545170ddf434677bdf7b8e1782a2291.pdf
    • https://static.usrfiles.com/ugd/0c41e7_18eb013b45f24c9b9bdae3f45e567624.pdf
    • https://static.usrfiles.com/ugd/e73fea_5efd50f2106642cda2a24ba15552eee5.pdf
    • https://static.usrfiles.com/ugd/4aae87_96fab1a716584c3885f65c21e92be7f0.pdf
    • https://static.usrfiles.com/ugd/0dd040_2277cc0836f1498d94a1d6e90393ded3.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_7bdfd9be30524dbcb7896b3cdbac5429.pdf
    • https://static.usrfiles.com/ugd/d61b30_24f2608b2b334e2097ade292a75c8b38.pdf
    • https://static.usrfiles.com/ugd/52b593_8a324035fb87450789f7c01dda6b1ab7.pdf
    • https://static.usrfiles.com/ugd/d6b5da_b1ffd7ab276741d49738775e6f9b4cef.pdf
    • https://static.usrfiles.com/ugd/ea9bdf_9b988444daca4374a9b0183396e1a37d.pdf
    • https://static.usrfiles.com/ugd/7e6083_e04a4602acc14a4c80097dea8f7f5890.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_off00006d28.bin
ca2b3a55247142631c425423ec0cde3b17c190997a33790b1826a0d1a97a295c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D28 5412 bytes
font_01_sfnt_off00007fad.bin
a0c610c5d99ab5b5d0858eb294a157cfc877689fa10862cbe14f2c3ca8729a24
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FAD 10060 bytes
font_02_sfnt_off0000a219.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0xA219 4324 bytes