Malicious PDF — malware analysis report

Static analysis result for SHA-256 3838238815b47c80…

MALICIOUS

PDF

41.9 KB Created: 2020-08-03 16:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 107f1faca9d28238328e85b8a8fcbb63 SHA-1: c220a83dfdc199494595a3075ce18efb8de6c2e3 SHA-256: 3838238815b47c8084557b4431df7856fb3043a0b281e9b038507b68a589a9b7
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a civil construction company profile. The document body, though heavily obfuscated, contains text related to 'civil construction company profile pdf' and the malicious URL. The presence of a link farm and the ML classifier's high confidence further support the malicious nature of this document.

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=civil+construction+company+profile+pdf
    • http://files.1lovesurfing.com.au/uploads/1/3/1/4/131437778/5708563.pdf
    • http://files.foundersparkhighlands.org/uploads/1/3/2/6/132683188/nizana.pdf
    • http://files.jsuhonorband.com/uploads/1/3/2/7/132710634/7bb2097d1c.pdf
    • https://cdn.shopify.com/s/files/1/0429/2273/7830/files/kimotewunajexuwuta.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/21816859722.pdf
    • https://cdn.shopify.com/s/files/1/0433/9122/1923/files/wojasafobubajuxedodesili.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2122/files/firunepanatakomewik.pdf
    • https://cdn.shopify.com/s/files/1/0438/9866/7163/files/jonomovedukoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9946/files/rosatalagugipexogab.pdf
    • https://cdn.shopify.com/s/files/1/0433/0268/2789/files/47602249479.pdf
    • https://cdn.shopify.com/s/files/1/0432/6260/7518/files/xorit.pdf
    • https://cdn.shopify.com/s/files/1/0431/1390/6333/files/brandenburg_concerto_5_sheet_music_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0431/7826/2689/files/9554351389.pdf
    • https://cdn.shopify.com/s/files/1/0428/2544/9628/files/36614031460.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/puliwaxaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/osrs_autocast_curse.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_off0000665e.bin
e71bf668ab1bc1150e7c0f3f83d21d1e088f353fdd44d7cf1ac6310be710ee0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x665E 5368 bytes
font_01_sfnt_off00007892.bin
3eb328c1474c50118b10e1936f1ccb1dd2e74d94a1a3ef869521756d94a2479b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7892 9964 bytes