Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5b0684d5b26bc1…

MALICIOUS

PDF

45.3 KB Created: 2020-09-08 09:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: faa87bd9878ce7140de7fca3ecbeba3d SHA-1: 3b94c7babcaebde046c4bac0895b949f225d2906 SHA-256: 4b5b0684d5b26bc1b509f48612701b25e324725e381147c36d648083d94adb3e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.me, which is likely used to funnel victims to a phishing or malware distribution site. The document also exhibits characteristics of a PDF link farm, with numerous embedded links to other PDFs, many hosted on static.usrfiles.com. The ML classifier strongly indicated maliciousness, supporting the presence of malicious redirector links.

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.me/wix?keyword=cardboard+box+castle+template
    • https://cdn.shopify.com/s/files/1/0440/9285/0328/files/the_testaments_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/6795/7660/files/6812636811.pdf
    • https://cdn.shopify.com/s/files/1/0429/6661/4175/files/jetizuxijijezusiginegop.pdf
    • https://cdn.shopify.com/s/files/1/0432/2911/8627/files/aquamet_water_meter_manual.pdf
    • https://static.usrfiles.com/ugd/2ca22b_0ab3b4383d894f8eb83aefe3abfa0d36.pdf
    • https://static.usrfiles.com/ugd/fa32a6_20fd75211c324d1e8273e3ed36f7aa07.pdf
    • https://static.usrfiles.com/ugd/3ceeb9_e9b91a7dab79448a9d48d54c4629d560.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_ace2e6590e7649b6b2614d1faf2bbec9.pdf
    • https://static.usrfiles.com/ugd/31593d_ec89587e7de14a239352016499a9d803.pdf
    • https://static.usrfiles.com/ugd/b8c837_0f6ca73f67e24d3f811886b111bc1d4b.pdf
    • https://static.usrfiles.com/ugd/50de67_a1e409258335490e8a0ec38070ddf921.pdf
    • https://static.usrfiles.com/ugd/868401_8ac02b21b07f44488387fed658365015.pdf
    • https://static.usrfiles.com/ugd/7e0eb0_6832e69c4d004ec99156e8fd2d43b1d9.pdf
    • https://static.usrfiles.com/ugd/cb4a18_515d351acf7d4772a186eec5d7395a3b.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_off0000669d.bin
513e79c2b34fe8fbe40d155283a036d1a20d182a45016ca34f896c8c7a232c02
pdf-font-stream PDF embedded font (sfnt) at offset 0x669D 5084 bytes
font_01_sfnt_off000077ee.bin
c01bb52ab14c4d3fd40222506aa50712f618a0019c4e97b4127fc77badb00830
pdf-font-stream PDF embedded font (sfnt) at offset 0x77EE 10120 bytes
font_02_sfnt_off00009a8d.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A8D 4324 bytes