Malicious PDF — malware analysis report

Static analysis result for SHA-256 881f8a77a75b5841…

MALICIOUS

PDF

42.6 KB Created: 2020-08-20 15:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28da6dde1e23b20ae6d949d9eb1893a1 SHA-1: 55bdd457860755ec5d8f8eb4e6bca949403404d0 SHA-256: 881f8a77a75b584116eaa5836d55107dc7f3b3e3e9552c70f2c01a87818409be
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=android+10+huawei+p9+lite'. This, combined with the 'PDF_SEO_LINK_FARM' heuristic indicating a large number of external links, suggests a phishing or scam attempt. The document body, though heavily obfuscated, contains fragments that appear to be related to the lure, such as 'Android 10 huawei p9 lite'. The ML classifier also strongly flagged this PDF as malicious.

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=android+10+huawei+p9+lite
    • http://files.linyuaner.com/uploads/1/3/1/3/131398140/ff68b.pdf
    • http://files.reveal-and-heal.com/uploads/1/3/1/4/131438843/kedonizupule.pdf
    • https://cdn.shopify.com/s/files/1/0437/6186/0757/files/los_primos_mx_mi_bello_angel.pdf
    • https://cdn.shopify.com/s/files/1/0432/8436/5468/files/suloperuz.pdf
    • https://cdn.shopify.com/s/files/1/0436/1525/6738/files/mupupavorufubinetezu.pdf
    • https://cdn.shopify.com/s/files/1/0440/8901/6472/files/dabiparesavozi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/woburorofinuxup.pdf
    • https://cdn.shopify.com/s/files/1/0429/1523/3959/files/81178123748.pdf
    • https://cdn.shopify.com/s/files/1/0435/5692/9687/files/welixowadilisenujotatop.pdf
    • https://cdn.shopify.com/s/files/1/0434/1284/8790/files/kifutujozevemilakawumur.pdf
    • https://cdn.shopify.com/s/files/1/0440/7505/7302/files/lal_chunariya_movie_songs.pdf
    • https://cdn.shopify.com/s/files/1/0430/3601/6802/files/busutes.pdf
    • https://cdn.shopify.com/s/files/1/0431/9592/4640/files/xewuxefiwaxepu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96280370261.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_off0000688f.bin
fe7d418557abcd5b7a2c20d6de6be20054447113930ad0e0d205d06dc6b92ff7
pdf-font-stream PDF embedded font (sfnt) at offset 0x688F 5300 bytes
font_01_sfnt_off00007aa1.bin
7a5c7d3633c15b5faab73fc2c79a40a34e58b826a784ec5aad1732eeab3bbed0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA1 10280 bytes