Malicious PDF — malware analysis report

Static analysis result for SHA-256 f542a604afa75485…

MALICIOUS

PDF

46.6 KB Created: 2020-07-26 11:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e979ebe2a7a5836caf7f2c2d6b71581e SHA-1: d4542062d2e72fee90e0779f5f96460feacb9ac2 SHA-256: f542a604afa75485b530e0d29f84c7df1c7475707549a8ac53a1354d1142bdd5
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Ac market app for android apk', suggesting a lure. The primary malicious IOC is the redirector URL, which is likely used to funnel users to further malicious content.

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.com/pify?keyword=ac+market+app++for+android+apk
    • http://files.ashleyscleaningservice.org/uploads/1/3/0/8/130814070/5765236.pdf
    • http://files.dsschoolla.org/uploads/1/3/0/7/130775017/zusisiwoler.pdf
    • http://files.itsallaboutthefood.us/uploads/1/3/2/8/132815388/jumironor_volatosi_sexiwonefobazel.pdf
    • http://files.newrootspress.ca/uploads/1/3/1/3/131382841/8659245.pdf
    • http://files.ashleyscleaningservice.org/uploads/1/3/0/8/130814070/57652
    • https://cdn.shopify.com/s/files/1/0431/5817/5901/files/97113047588.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87664315042.pdf
    • https://cdn.shopify.com/s/files/1/0431/7741/0720/files/63096922311.pdf
    • https://cdn.shopify.com/s/files/1/0431/8425/9231/files/debaxibisubufijus.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27360052690.pdf
    • https://cdn.shopify.com/s/files/1/0430/7927/0549/files/47226288348.pdf
    • https://cdn.shopify.com/s/files/1/0434/8212/0357/files/18730910048.pdf
    • https://cdn.shopify.com/s/files/1/0433/3728/5797/files/85870864026.pdf
    • https://cdn.shopify.com/s/files/1/0431/3448/4648/files/sajepix.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6867/files/xamopebutunoxivema.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/kabeni.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_off0000794b.bin
a337fe1e355b020d71676d5abadb099e97ecd95793a1bdd34e104e8a822875e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x794B 4932 bytes
font_01_sfnt_off000089e9.bin
d10ba19c40c5d0f0b17cd4bdb61ebf410fe5efd8005fd95d4d2426879e1e5027
pdf-font-stream PDF embedded font (sfnt) at offset 0x89E9 10328 bytes