Malicious PDF — malware analysis report

Static analysis result for SHA-256 a277c2cbf33ae8de…

MALICIOUS

PDF

48.0 KB Created: 2020-08-12 16:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af635beb331b09e586b8689d967e0480 SHA-1: d81c4a40f35f25253621578a28a4564eb07dae1c SHA-256: a277c2cbf33ae8de25f312a25a7e0bcfe2241c00a9f6b0863ac0b8099344cad3
150 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific redirector URL, 'https://ttraff.com/pify?keyword=postage+rate+increase+2020+pdf', which is flagged as malicious. The document body, though heavily obfuscated, contains references to postage rate increases and numerous URLs, many hosted on Shopify, suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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/pify?keyword=postage+rate+increase+2020+pdf
    • http://fuput.stoneycreektamaskan.com/uploads/1/3/1/6/131636664/pedelojorapi.pdf
    • http://files.skyshedpodpa.com/uploads/1/3/0/8/130814774/wudege.pdf
    • http://files.theosleadershipnetwork.org/uploads/1/3/1/4/131453541/c8d490e6a8a.pdf
    • http://files.sfwarevents.org/uploads/1/3/0/7/130776514/1c17f7d.pdf
    • http://files.jojoamo.com/uploads/1/3/0/8/130874514/zugosadanejasu_japal_rokuxarukitum_gifevudate.pdf
    • https://cdn.shopify.com/s/files/1/0429/9577/7699/files/rexavekulelixugatazilu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1806/7876/files/18625021875.pdf
    • https://cdn.shopify.com/s/files/1/0436/4877/8400/files/jubojotapolu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6003/5735/files/refoxinenotewejawiw.pdf
    • https://cdn.shopify.com/s/files/1/0449/8866/1919/files/digestive_tract_histology.pdf
    • https://cdn.shopify.com/s/files/1/0432/8692/1376/files/67325714479.pdf
    • https://cdn.shopify.com/s/files/1/0432/1044/0862/files/51694316522.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4455/files/thinking_in_java_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0427/6859/7158/files/rent_agreement_format_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0437/9118/8117/files/nejevon.pdf
    • https://cdn.shopify.com/s/files/1/0428/2574/4540/files/63439959375.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nijudesiko.pdf
    • https://cdn.shopify.com/s/files/1/0434/1058/7800/files/74617710230.pdf
    • https://cdn.shopify.com/s/files/1/0431/1059/6765/files/square_root_of_13.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_off00007c00.bin
890e27f81e1313a9e25e37073234577548addc38777505ce32f2123fac5af008
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C00 5568 bytes
font_01_sfnt_off00008efc.bin
11f33c86ea5b8275cd4ef5d2beb961e32544113ff96ac4a0edfd0b2dc37ade48
pdf-font-stream PDF embedded font (sfnt) at offset 0x8EFC 10536 bytes