Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa8bbd31236030f…

MALICIOUS

PDF

43.0 KB Created: 2020-08-01 08:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97a538c05b19e62cacc56e6f5be34c4b SHA-1: bb821056198f7276964aa5e1d083c527d8124c19 SHA-256: 7aa8bbd31236030f173edae04eb9da2e709dccb7b595c78f1e7423eb15b23eba
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as information about 'Wega espresso machine maintenance'. The document also features a large number of external PDF links, many hosted on Shopify, likely part of a link farm to improve search engine ranking for malicious content. The ML classifier strongly indicates malicious intent.

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=wega+espresso+machine+maintenance
    • http://files.danielnistico.net/uploads/1/3/1/4/131407445/gufawonim-raxawuju-wivoxesi-gisizovexide.pdf
    • http://files.windsurfingreligion.com/uploads/1/3/1/4/131453395/fopiku-fidololafa-maladase.pdf
    • http://files.larissafall.com/uploads/1/3/2/6/132682731/a3aa317b67a4f.pdf
    • http://files.windsurfingreligion
    • https://cdn.shopify.com/s/files/1/0429/5180/3033/files/wavegovamulofebijufimifok.pdf
    • https://cdn.shopify.com/s/files/1/0430/5652/9565/files/sewepewulogiro.pdf
    • https://cdn.shopify.com/s/files/1/0432/1381/5966/files/zefen.pdf
    • https://cdn.shopify.com/s/files/1/0428/9173/9295/files/tinuruxumofon.pdf
    • https://cdn.shopify.com/s/files/1/0437/8735/4270/files/15879878974.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7924/files/97301859000.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9488/files/98246311699.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4650/files/73456213066.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32177526878.pdf
    • https://cdn.shopify.com/s/files/1/0436/1427/3698/files/82090060342.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/72723341820.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/wubojelesaxorar.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_off00006ab5.bin
cfbef55876b9809e8d642115af029c1e851a27db4016a7996b5778c67da12751		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB5 5328 bytes
font_01_sfnt_off00007cbf.bin
62007d81385c657b34bbfde0b59afd326f99011a632fa0b8d313e41640cc4798		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CBF 9948 bytes

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